Bugfixes: don't select dirs and don't crash on write settings

Only select files when archiving pics from filemanager. While at it, I
noticed a crash on close when no item is selected in PicturesWidget. So
check if MappingData is valid on writing settings. Best way is
MappingData::isValid(), and for that I needed a explicit constructor.

1 files changed, 1 insertions, 1 deletions

diff --git a/newpicsdialog.cpp b/newpicsdialog.cpp
index 0ededef..272bf2d 100644
--- a/newpicsdialog.cpp
+++ b/newpicsdialog.cpp
@@ -272,7 +272,7 @@ void NewPicFilesModel::setFiles(const QStringList &paths) {
 
 void NewPicFilesModel::addFile(const QString &path){
     QFileInfo fi(path);
-    if(!fi.exists()){
+    if(!fi.exists() || !fi.isFile()){
         return;
     }
     QString md5 = Helper::md5Sum(fi.absoluteFilePath());