feat: GC only if there's something to gc

pantograph/server.py

@@ -77,12 +77,10 @@ class Server:
 
         Must be called periodically.
         """
+        if self.to_remove_goal_states:
             self.run('goal.delete', {'stateIds': self.to_remove_goal_states})
             self.to_remove_goal_states.clear()
 
-    def reset(self):
-        return self.run("reset", {})
-
     def expr_type(self, expr: str) -> Expr:
         """
         Evaluate the type of a given expression. This gives an error if the