[flatpak] fix -> not displaying the runtimes icons on the summary window

CHANGELOG.md

@@ -12,6 +12,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
         - sometimes crashing when there are packages to be removed 
 - AppImage
     - "Checking symlinks" initial task hanging if an installed AppImage data does not contain the installed directory field ('install_dir')   
+- Flatpak
+    - not displaying the runtimes icons on the summary window
 
 ## [0.9.7] 2020-09-11
 ### Features

bauh/gems/flatpak/model.py

@@ -120,3 +120,7 @@ class FlatpakApplication(SoftwarePackage):
     def __eq__(self, other):
         if isinstance(other, FlatpakApplication):
             return self.id == other.id and self.installation == other.installation and self.branch == other.branch
+
+    def get_disk_icon_path(self) -> str:
+        if not self.runtime:
+            return super(FlatpakApplication, self).get_disk_icon_path()