[analyzer] Change warding in a path diagnostic:

"No method actually called because receiver is nil" ->
"No method is called because receiver is nil"

llvm-svn: 154077

clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp

@@ -393,7 +393,7 @@ PathDiagnosticPiece *NilReceiverBRVisitor::VisitNode(const ExplodedNode *N,
   // Issue a message saying that the method was skipped.
   PathDiagnosticLocation L(Receiver, BRC.getSourceManager(),
                                      N->getLocationContext());
-  return new PathDiagnosticEventPiece(L, "No method actually called "
+  return new PathDiagnosticEventPiece(L, "No method is called "
       "because the receiver is nil");
 }