fix: trying to load null disk icon path

bauh/resources/locale/en

@@ -90,3 +90,4 @@ back=back
 show=show
 ask.continue=Continue ?
 cancel=cancel
+status.caching_data=Caching {} data to disk

bauh/resources/locale/es

@@ -91,4 +91,5 @@ copy=copiar
 back=volver
 show=mostrar
 ask.continue=¿Continuar ?
-cancel=cancelar
+cancel=cancelar
+status.caching_data=Cacheando los datos de {} para el disco

bauh/resources/locale/pt

@@ -91,4 +91,5 @@ copy=copiar
 back=voltar
 show=mostrar
 ask.continue=Continuar ?
-cancel=cancelar
+cancel=cancelar
+status.caching_data=Cacheando dados de {} para o disco

bauh/view/qt/apps_table.py

@@ -328,7 +328,7 @@ class AppsTable(QTableWidget):
         col.setFlags(Qt.ItemIsSelectable | Qt.ItemIsEnabled)
         col.setToolTip(self.window.locale_keys['app.name'].lower())
 
-        if self.disk_cache and app_v.model.supports_disk_cache() and os.path.exists(app_v.model.get_disk_icon_path()):
+        if self.disk_cache and app_v.model.supports_disk_cache() and app_v.model.get_disk_icon_path() and os.path.exists(app_v.model.get_disk_icon_path()):
             with open(app_v.model.get_disk_icon_path(), 'rb') as f:
                 icon_bytes = f.read()
                 pixmap = QPixmap()