return collective string for all detectors in run action

webservice/webservice.py

@@ -1163,6 +1163,9 @@ class ActionsServer:
             self, run_nrs, rid, detectors, action, instrument, cycle, proposal,
             request_time
     ) -> (str, Optional[str]):
+        report = ""
+        ret = ""
+        delim = ", "
         # run xfel_calibrate
         for karabo_id, dconfig in detectors.items():
             detector = dconfig['detector-type']
@@ -1179,16 +1182,18 @@ class ActionsServer:
             ).split()
 
             cmd = parse_config(cmd, dconfig)
-
-            ret = await run_action(self.job_db, cmd, self.mode,
-                                   proposal, run_nrs[-1], rid)
-
+            # TODO: Add detector info in returned run action status.
+            ret += (
+                await run_action(
+                    self.job_db, cmd, self.mode,
+                    proposal, run_nrs[-1], rid
+                ) + delim
+            )
             if '--report-to' in cmd[:-1]:
                 report_idx = cmd.index('--report-to') + 1
-                report = cmd[report_idx] + '.pdf'
-            else:
-                report = None
-            return ret, report
+                report += cmd[report_idx] + '.pdf' + delim
+        # return string without a tailing comma.
+        return ret[:-2], report[:-2] if report != delim else None
 
 parser = argparse.ArgumentParser(
     description='Start the calibration webservice')