TOSQUASH 313ad93: yeah dun use `._message` as tb-str..

tractor/_exceptions.py

@@ -639,13 +639,16 @@ class RemoteActorError(Exception):
             self.extra_body_fields,
         )
 
-        # ?TODO, ensure the `.message` doesn't show up 2x in
-        # output ya?
         tb_str: str = (
             self.tb_str
-            or
+            #
-            self._message
+            # ^TODO? what to use instead? if anything?
+            # -[ ] ensure the `.message` doesn't show up 2x in output ya?
+            # -[ ] ._message isn't really right?
+            # or
+            # self._message
         )
+        if tb_str:
             from tractor.devx import (
                 pformat_boxed_tb,
             )