Qmake: Do not turn a CONFIG variable with spaces into several

When e.g. examining 'CONFIG+=foo bar' Creator would turn that into
CONFIG+=foo and 'CONFIG+=foo bar', which seems wrong to me.

Task-number: QTCREATORBUG-16492
Change-Id: I37b83f1e8415d421abb2df7a9466651bff502d17
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

src/plugins/qmakeprojectmanager/makefileparse.cpp

@@ -208,9 +208,10 @@ void MakeFileParse::parseAssignments(QList<QMakeAssignment> *assignments)
                 } else {
                     newValues.append(value);
                 }
+            }
+            if (!newValues.isEmpty()) {
                 QMakeAssignment newQA = qa;
                 newQA.value = newValues.join(QLatin1Char(' '));
-                if (!newValues.isEmpty())
                 assignments->append(newQA);
             }
         } else {