fix: address comments

Signed-off-by: yihong0618 <zouzou0208@gmail.com>

Author: yihong0618

Lib/pdb.py

@@ -925,10 +925,10 @@ def _read_code(self, line):
         return code, buffer, is_await_code
 
     def default(self, line):
-        if line[:1] == '!': line = line[1:].strip()
         if not self.curframe:
             self.error("No current frame.")
             return
+        if line[:1] == '!': line = line[1:].strip()
         locals = self.curframe.f_locals
         globals = self.curframe.f_globals
         try: