KT-281 fixed

idea/testData/cfg/Basic.instructions

@@ -84,6 +84,7 @@ fun foo(a : Boolean, b : Int) : Unit {}
 ---------------------
 l0:
     <START>
+    read (Unit)
 l1:
     <END>
 error:
@@ -94,6 +95,7 @@ fun genfun<T>() : Unit {}
 ---------------------
 l0:
     <START>
+    read (Unit)
 l1:
     <END>
 error:
@@ -104,6 +106,7 @@ fun flfun(f : fun () : Any) : Unit {}
 ---------------------
 l0:
     <START>
+    read (Unit)
 l1:
     <END>
 error:

idea/testData/cfg/EmptyFunction.instructions

@@ -3,6 +3,7 @@ fun empty() {}
 ---------------------
 l0:
     <START>
+    read (Unit)
 l1:
     <END>
 error:

idea/testData/checker/FunctionReturnTypes.jet

@@ -148,3 +148,18 @@ fun f(): Int {
 }
 
 fun f(): Int = if (1 < 2) 1 else returnNothing()
+
+fun blockNoReturnIfEmptyIf(): Int {
+    if (1 < 2) <error>{}</error> else <error>{}</error>
+}
+
+fun blockNoReturnIfUnitInOneBranch(): Int {
+  if (1 < 2) {
+    return 1
+  } else {
+    if (3 < 4) <error>{
+    }</error> else {
+      return 21
+    }
+  }
+}