Add waiting and empty `` to the option of the job state in the job se…

…arch page (#681)

src/aiidalab_qe/app/utils/search_jobs.py

@@ -91,8 +91,8 @@ def setup_widgets(self):
             lambda x: [] if x is None else x
         )
         self.job_state_dropdown = ipw.Dropdown(
-            options=["finished", "except", "killed"],
-            value="finished",
+            options=["", "finished", "waiting", "except", "killed"],
+            value="",
             description="Job State:",
         )
         self.label_search_field = ipw.Text(