Don't complain about compareTo returning ERROR type instead of Int

compiler/frontend/src/org/jetbrains/jet/lang/types/expressions/BasicExpressionTypingVisitor.java

@@ -974,7 +974,7 @@ public class BasicExpressionTypingVisitor extends ExpressionTypingVisitor {
         }
         else if (OperatorConventions.COMPARISON_OPERATIONS.contains(operationType)) {
             JetType compareToReturnType = getTypeForBinaryCall(context.scope, Name.identifier("compareTo"), context, expression);
-            if (compareToReturnType != null) {
+            if (compareToReturnType != null && !ErrorUtils.isErrorType(compareToReturnType)) {
                 TypeConstructor constructor = compareToReturnType.getConstructor();
                 JetStandardLibrary standardLibrary = JetStandardLibrary.getInstance();
                 TypeConstructor intTypeConstructor = standardLibrary.getInt().getTypeConstructor();

compiler/testData/diagnostics/tests/CompareToWithErrorType.kt

@@ -0,0 +1,5 @@
+fun test() {
+  if (<!UNRESOLVED_REFERENCE!>x<!> > 0) {
+
+  }
+}

compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java

@@ -141,6 +141,11 @@ public class JetDiagnosticsTestGenerated extends AbstractDiagnosticsTestWithEage
             doTest("compiler/testData/diagnostics/tests/ClassObjects.kt");
         }
         
+        @TestMetadata("CompareToWithErrorType.kt")
+        public void testCompareToWithErrorType() throws Exception {
+            doTest("compiler/testData/diagnostics/tests/CompareToWithErrorType.kt");
+        }
+        
         @TestMetadata("Constants.kt")
         public void testConstants() throws Exception {
             doTest("compiler/testData/diagnostics/tests/Constants.kt");