fix problems with __bool__ values

ca_manager/models/authority.py

@@ -48,8 +48,8 @@ class Authority(CustomModel):
             help_text='is root authority?',
             )
 
-    def __bool__(self):
-        return os.path.exists(self.path)
+#    def __bool__(self):
+#        return os.path.exists(self.path)
 
     @property
     def path(self):

ca_manager/shell.py

@@ -51,7 +51,7 @@ class CAManagerShell(cmd.Cmd):
 
         ca = self.ca_manager.ca[argv[0]]
 
-        if ca:
+        if ca != None:
             ca_description = """
             Certification authority: %s
             --------------------------------------------------