Do not insert returns before Nothing in "Replace return with 'if'"

So #KT-22159 Fixed

idea/testData/intentions/branched/unfolding/returnToIf/ifWithBreak.kt

@@ -0,0 +1,10 @@
+fun test(b: Boolean): Int {
+    while (true) {
+        <caret>return if (b) {
+            1
+        } else {
+            break
+        }
+    }
+    return 0
+}

idea/testData/intentions/branched/unfolding/returnToIf/ifWithBreak.kt.after

@@ -0,0 +1,10 @@
+fun test(b: Boolean): Int {
+    while (true) {
+        if (b) {
+            return 1
+        } else {
+            break
+        }
+    }
+    return 0
+}

idea/testData/intentions/branched/unfolding/returnToIf/ifWithContinue.kt

@@ -0,0 +1,12 @@
+fun test(b: Boolean): Int {
+    var i = 0
+    while (i == 0) {
+        <caret>return if (b) {
+            1
+        } else {
+            i++
+            continue
+        }
+    }
+    return 0
+}

idea/testData/intentions/branched/unfolding/returnToIf/ifWithContinue.kt.after

@@ -0,0 +1,12 @@
+fun test(b: Boolean): Int {
+    var i = 0
+    while (i == 0) {
+        if (b) {
+            return 1
+        } else {
+            i++
+            continue
+        }
+    }
+    return 0
+}

idea/testData/intentions/branched/unfolding/returnToIf/ifWithInnerReturn.kt

@@ -0,0 +1,9 @@
+fun test(b: Boolean): Int {
+    while (true) {
+        <caret>return if (b) {
+            1
+        } else {
+            return 0
+        }
+    }
+}

idea/testData/intentions/branched/unfolding/returnToIf/ifWithInnerReturn.kt.after

@@ -0,0 +1,9 @@
+fun test(b: Boolean): Int {
+    while (true) {
+        if (b) {
+            return 1
+        } else {
+            return 0
+        }
+    }
+}

idea/testData/intentions/branched/unfolding/returnToIf/ifWithNothing.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+fun test(b: Boolean): Int {
+    <caret>return if (b) {
+        1
+    } else {
+        TODO()
+    }
+}

idea/testData/intentions/branched/unfolding/returnToIf/ifWithNothing.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+fun test(b: Boolean): Int {
+    if (b) {
+        return 1
+    } else {
+        TODO()
+    }
+}

idea/testData/intentions/branched/unfolding/returnToIf/ifWithThrow.kt

@@ -0,0 +1,7 @@
+fun test(b: Boolean): Int {
+    <caret>return if (b) {
+        throw AssertionError()
+    } else {
+        1
+    }
+}

idea/testData/intentions/branched/unfolding/returnToIf/ifWithThrow.kt.after

@@ -0,0 +1,7 @@
+fun test(b: Boolean): Int {
+    if (b) {
+        throw AssertionError()
+    } else {
+        return 1
+    }
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithBreak.kt

@@ -0,0 +1,9 @@
+fun test(b: Boolean): Int {
+    loop@ while (true) {
+        <caret>return when (b) {
+            true -> 1
+            else -> break@loop
+        }
+    }
+    return 0
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithBreak.kt.after

@@ -0,0 +1,9 @@
+fun test(b: Boolean): Int {
+    loop@ while (true) {
+        when (b) {
+            true -> return 1
+            else -> break@loop
+        }
+    }
+    return 0
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithContinue.kt

@@ -0,0 +1,13 @@
+fun test(b: Boolean): Int {
+    var i = 0
+    loop@while (i == 0) {
+        <caret>return when (b) {
+            true -> 1
+            else -> {
+                i++
+                continue@loop
+            }
+        }
+    }
+    return 0
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithContinue.kt.after

@@ -0,0 +1,13 @@
+fun test(b: Boolean): Int {
+    var i = 0
+    loop@while (i == 0) {
+        when (b) {
+            true -> return 1
+            else -> {
+                i++
+                continue@loop
+            }
+        }
+    }
+    return 0
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithInnerReturn.kt

@@ -0,0 +1,8 @@
+fun test(b: Boolean): Int {
+    while (true) {
+        <caret>return when (b) {
+            true -> 1
+            else -> return 0
+        }
+    }
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithInnerReturn.kt.after

@@ -0,0 +1,8 @@
+fun test(b: Boolean): Int {
+    while (true) {
+        when (b) {
+            true -> return 1
+            else -> return 0
+        }
+    }
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithNothing.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+fun test(b: Boolean): Int {
+    <caret>return when (b) {
+        true -> 1
+        else -> TODO()
+    }
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithNothing.kt.after

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+fun test(b: Boolean): Int {
+    when (b) {
+        true -> return 1
+        else -> TODO()
+    }
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithThrow.kt

@@ -0,0 +1,6 @@
+fun foo(b: Boolean): Int {
+    <caret>return when (b) {
+        true -> throw AssertionError()
+        else -> 1
+    }
+}

idea/testData/intentions/branched/unfolding/returnToWhen/whenWithThrow.kt.after

@@ -0,0 +1,6 @@
+fun foo(b: Boolean): Int {
+    when (b) {
+        true -> throw AssertionError()
+        else -> return 1
+    }
+}