IDEA-218805 NullPointerException when find cause quick fix applied

GitOrigin-RevId: fcac9cd13e2f714bb6bfb0699e825bc5a190d68a

java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/TrackingRunner.java

@@ -927,9 +927,10 @@ public class TrackingRunner extends StandardDataFlowRunner {
             else {
               continue;
             }
-            return Arrays.asList(getFactory().getRelationFactory().createRelation(left, type, right),
-                                 getFactory().getRelationFactory()
-                                   .createRelation(actualVar, actualRelation.myRelationType, actualRelation.myCounterpart));
+            DfaRelationValue.Factory factory = getFactory().getRelationFactory();
+            DfaRelationValue rel1 = factory.createRelation(left, type, right);
+            DfaRelationValue rel2 = factory.createRelation(actualVar, actualRelation.myRelationType, actualRelation.myCounterpart);
+            return StreamEx.of(rel1, rel2).nonNull().toImmutableList();
           }
         }
       }

java/java-tests/testData/inspection/dataFlow/tracker/EnumCompare.java

@@ -0,0 +1,15 @@
+/*
+Value is always false (code == ReturnStatus.NOT_FOUND; line#8)
+  It's known that 'code != ReturnStatus.NOT_FOUND' from line #7 (code != ReturnStatus.SUCCESS; line#7)
+ */
+class SampleClazz {
+  public void foo(ReturnStatus code) {
+    if (code != ReturnStatus.SUCCESS) {
+    } else if (<selection>code == ReturnStatus.NOT_FOUND</selection>) {
+    }
+  }
+
+  enum ReturnStatus {
+    SUCCESS, NOT_FOUND
+  }
+}

java/java-tests/testSrc/com/intellij/java/codeInspection/DataFlowInspectionTrackerTest.java

@@ -178,4 +178,5 @@ public class DataFlowInspectionTrackerTest extends LightJavaCodeInsightFixtureTe
   public void testFinalFieldInitialized() { doTest(); }
   public void testFinalFieldInitializedCtor() { doTest(); }
   public void testEqualsNull() { doTest(); }
+  public void testEnumCompare() { doTest(); }
 }