ReplaceNullCheckInspection: add qualifier for field null check, simplify

java/java-tests/testData/inspection/requireNonNull/beforeStreamEmptyOfField.java

@@ -0,0 +1,20 @@
+// "Replace condition with Stream.ofNullable" "true"
+
+import java.util.*;
+import java.util.stream.Stream;
+
+class Other {
+  Object val = new Object();
+
+}
+
+class Test {
+
+  public Stream test(Other o) {
+    if<caret> (o.val == null) {
+      return Stream.empty();
+    } else {
+      return Stream.ofNullable(o.val);
+    }
+  }
+}