Fix bug #545: Keyring doesn't work with KDE Plasma5

CHANGES

@@ -1,6 +1,7 @@
 Back In Time
 
 Version 1.1.13
+* Fix bug: Keyring doesn't work with KDE Plasma5 (https://github.com/bit-team/backintime/issues/545)
 * Fix bug: Qt4 built-in phrases where not translated (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=816197)
 * Fix bug: configure ingnore unknown args (https://github.com/bit-team/backintime/issues/547)
 * Fix bug: snapshots-list on command-line was not sorted

common/tools.py

@@ -784,6 +784,8 @@ def keyring_supported():
     except: pass
     try: backends.append(keyring.backends.kwallet.Keyring)
     except: pass
+    try: backends.append(keyring.backends.kwallet.DBusKeyring)
+    except: pass
     try: backends.append(keyring.backend.SecretServiceKeyring)
     except: pass
     try: backends.append(keyring.backend.GnomeKeyring)
@@ -794,9 +796,9 @@ def keyring_supported():
         displayName = keyring.get_keyring().__module__
     except:
         displayName = str(keyring.get_keyring())
-    if backends:
+    if backends and isinstance(keyring.get_keyring(), tuple(backends)):
         logger.debug("Found appropriate keyring '{}'".format(displayName))
-        return isinstance(keyring.get_keyring(), tuple(backends))
+        return True
     logger.debug("No appropriate keyring found. '{}' can't be used with BackInTime".format(displayName))
     return False