Inliner: don't take into account nonexistent PSI to keep parameter

So #KT-17272 Fixed

idea/src/org/jetbrains/kotlin/idea/codeInliner/CodeInliner.kt

@@ -305,6 +305,7 @@ class CodeInliner<TCallElement : KtElement>(
             is KtBinaryExpression -> if (sideEffectOnly) left.shouldKeepValue(usageCount) || right.shouldKeepValue(usageCount) else true
             is KtIfExpression -> if (sideEffectOnly) condition.shouldKeepValue(usageCount) || then.shouldKeepValue(usageCount) || `else`.shouldKeepValue(usageCount) else true
             is KtBinaryExpressionWithTypeRHS -> true
+            null -> false
             else -> true
         }
     }

idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt

@@ -0,0 +1,5 @@
+fun manyParams(used: String, unused: String) = println(used)
+
+fun callMany() {
+    <caret>manyParams("op", "qr")
+}

idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt.after

@@ -0,0 +1,3 @@
+fun callMany() {
+    println("op")
+}

idea/tests/org/jetbrains/kotlin/idea/refactoring/inline/InlineTestGenerated.java

@@ -118,6 +118,12 @@ public class InlineTestGenerated extends AbstractInlineTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("DoNotKeepString.kt")
+            public void testDoNotKeepString() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("ExplicitReturnType.kt")
             public void testExplicitReturnType() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/inline/function/expressionBody/ExplicitReturnType.kt");