fix: Prevent submission dialog sometimes closing on exceptions (#329)

Signed-off-by: Samuel Anderson <119458760+AWS-Samuel@users.noreply.github.com>

src/deadline/client/ui/dialogs/submit_job_to_deadline_dialog.py

@@ -385,6 +385,9 @@ def on_submit(self):
         """
         Perform a submission when the submit button is pressed
         """
+        # Unset any cached response
+        self.create_job_response = None
+
         # Retrieve all the settings into the dataclass
         settings = self.job_settings_type()
         self.shared_job_settings.update_settings(settings)