Fix startup messages with bad filename (#720)

Fixes #10885

gramps/cli/arghandler.py

@@ -382,7 +382,7 @@ class ArgHandler:
                 self.open = db_path
                 self.__open_action()
             else:
-                sys.exit(1)
+                sys.exit(_("Error: cannot open '%s'") % self.open_gui)
             return db_path
 
         # if not open_gui, parse any command line args. We can only have one

gramps/gui/grampsgui.py

@@ -369,8 +369,11 @@ def __startgramps(errors, argparser):
         quit_now = True
         if err.code:
             exit_code = err.code
+            if isinstance(err.code, str):
+                LOG.error(err.code, exc_info=False)
+            else:
                 LOG.error("Gramps terminated with exit code: %d.", err.code,
-                      exc_info=True)
+                          exc_info=False)
     except OSError as err:
         quit_now = True
         exit_code = err.errno or 1