PSI: Make JetPostfixExpression.getBaseExpression() nullable

#KT-7761 Fixed

idea/ide-common/src/org/jetbrains/kotlin/resolve/lazy/PartialBodyResolveFilter.kt

@@ -174,7 +174,7 @@ class PartialBodyResolveFilter(
                 expression.acceptChildren(this)
 
                 if (expression.getOperationToken() == JetTokens.EXCLEXCL) {
-                    addIfCanBeSmartCast(expression.getBaseExpression())
+                    addIfCanBeSmartCast(expression.getBaseExpression() ?: return)
                 }
             }
 

idea/idea-analysis/src/org/jetbrains/kotlin/idea/intentions/OperatorToFunctionIntention.kt

@@ -40,6 +40,7 @@ public class OperatorToFunctionIntention : JetSelfTargetingIntention<JetExpressi
         private fun isApplicablePostfix(element: JetPostfixExpression, caretOffset: Int): Boolean {
             val opRef = element.getOperationReference()
             if (!opRef.getTextRange().containsOffset(caretOffset)) return false
+            if (element.getBaseExpression() == null) return false
             return when (opRef.getReferencedNameElementType()) {
                 JetTokens.PLUSPLUS, JetTokens.MINUSMINUS -> true
                 else -> false
@@ -98,7 +99,7 @@ public class OperatorToFunctionIntention : JetSelfTargetingIntention<JetExpressi
 
         private fun convertPostFix(element: JetPostfixExpression): JetExpression {
             val op = element.getOperationReference().getReferencedNameElementType()
-            val base = element.getBaseExpression().getText()
+            val base = element.getBaseExpression()!!.getText()
 
             val call = when (op) {
                 JetTokens.PLUSPLUS -> "inc()"

idea/idea-core/src/org/jetbrains/kotlin/idea/core/refactoring/JetNameSuggester.java

@@ -224,7 +224,12 @@ public class JetNameSuggester {
         return matcher.replaceAll("");
     }
     
-    private static void addNamesForExpression(final ArrayList<String> result, JetExpression expression, final JetNameValidator validator) {
+    private static void addNamesForExpression(
+            final ArrayList<String> result,
+            @Nullable JetExpression expression,
+            final JetNameValidator validator) {
+        if (expression == null) return;
+
         expression.accept(new JetVisitorVoid() {
             @Override
             public void visitQualifiedExpression(@NotNull JetQualifiedExpression expression) {

idea/src/org/jetbrains/kotlin/idea/intentions/branchedTransformations/intentions/DoubleBangToIfThenIntention.kt

@@ -37,11 +37,14 @@ import org.jetbrains.kotlin.resolve.bindingContextUtil.isUsedAsStatement
 
 public class DoubleBangToIfThenIntention : JetSelfTargetingRangeIntention<JetPostfixExpression>(javaClass(), "Replace '!!' expression with 'if' expression") {
     override fun applicabilityRange(element: JetPostfixExpression): TextRange? {
-        return if (element.getOperationToken() == JetTokens.EXCLEXCL)  element.getOperationReference().getTextRange() else null
+        return if (element.getOperationToken() == JetTokens.EXCLEXCL && element.getBaseExpression() != null)
+            element.getOperationReference().getTextRange()
+        else
+            null
     }
 
     override fun applyTo(element: JetPostfixExpression, editor: Editor) {
-        val base = JetPsiUtil.safeDeparenthesize(element.getBaseExpression())
+        val base = JetPsiUtil.safeDeparenthesize(element.getBaseExpression()!!)
         val expressionText = formatForUseInExceptionArgument(base.getText()!!)
 
         val defaultException = JetPsiFactory(element).createExpression("throw NullPointerException()")

idea/src/org/jetbrains/kotlin/idea/quickfix/ExclExclCallFix.java

@@ -168,7 +168,7 @@ public class ExclExclCallFix implements IntentionAction {
             PsiElement parent = exclExclElement.getParent();
             if (parent != null) {
                 PsiElement operationParent = parent.getParent();
-                if (operationParent instanceof JetPostfixExpression) {
+                if (operationParent instanceof JetPostfixExpression && ((JetPostfixExpression) operationParent).getBaseExpression() != null) {
                     return (JetPostfixExpression) operationParent;
                 }
             }