actually show errors from bogus SUBDIRS entries

this got lost in 51ba32bc.

Change-Id: Ic0c982cff8d4030eae8e942f9324fd6f49c68aa9
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/qmakeprojectmanager/qmakenodes.cpp

@@ -1858,8 +1858,8 @@ EvalResult *QmakeProFileNode::evaluate(const EvalInput &input)
     if (result->state == EvalResult::EvalOk) {
         if (result->projectType == SubDirsTemplate) {
             QStringList errors;
-            result->errors.append(errors);
             FileNameList subDirs = subDirsPaths(input.readerExact, input.projectDir, &result->subProjectsNotToDeploy, &errors);
+            result->errors.append(errors);
 
             foreach (const Utils::FileName &subDirName, subDirs) {
                 IncludedPriFile *subDir = new IncludedPriFile;