not adding flathub remote when it is not set

fpakman/core/flatpak/controller.py

@@ -147,7 +147,7 @@ class FlatpakManager(ApplicationManager):
         raise Exception("'refresh' is not supported for {}".format(app.__class__.__name__))
 
     def prepare(self):
-        flatpak.set_default_remotes()
+        pass
 
     def list_updates(self) -> List[ApplicationUpdate]:
         updates = []
@@ -179,4 +179,5 @@ class FlatpakManager(ApplicationManager):
         return updates
 
     def list_warnings(self) -> List[str]:
-        return None
+        if not flatpak.has_remotes_set():
+            return [self.locale_keys['flatpak.notification.no_remotes']]

fpakman/core/flatpak/flatpak.py

@@ -1,6 +1,6 @@
 import re
 import subprocess
-from typing import List, Set
+from typing import List
 
 from fpakman.core import system
 from fpakman.core.exception import NoInternetException
@@ -219,3 +219,7 @@ def install_and_stream(app_id: str, origin: str):
 
 def set_default_remotes():
     system.run_cmd('flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo')
+
+
+def has_remotes_set() -> bool:
+    return bool(system.run_cmd('{} remotes'.format(BASE_CMD)).strip())