Fix plugin unit test

Since d43a36c816 the code parser could
have been internally triggered already while still evaluating the
project. This made the parser trigger a parsingFinished() already for
a parse where not the full project had been available inside the
code model which made the plugin unit test fail.

Change-Id: I6cc787c24205cb82c6c2636f79bd0acc5c778c64
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

plugins/autotest/testcodeparser.cpp

@@ -547,7 +547,10 @@ void TestCodeParser::onProjectPartsUpdated(ProjectExplorer::Project *project)
 {
     if (project != currentProject())
         return;
-    updateTestTree();
+    if (!m_parserEnabled || m_parserState == Disabled)
+        m_fullUpdatePostponed = true;
+    else
+        emitUpdateTestTree();
 }
 
 void TestCodeParser::removeFiles(const QStringList &files)