added more explicit error when certificate file is missing

scripts/StagingUserAssignation.py

@@ -78,15 +78,18 @@ else:
 # Initialisation de l'api Airwatch
 try:
     airwatch = AirwatchAPI(settings)
+    # Recherche des appareils filtré sur l'utilisateur de staging
+    devices = airwatch.GetDevices(stagingUser)
     logger.info("Airwatch server connection succeeded")
-except requests.exceptions.ConnectionError as error:
+except FileNotFoundError as F:
+    logger.critical(f"Certificate file not found for CMSURL authentication : {F}")
+    os.remove(lockFile)
+    exit(1)
+except Exception as error:
     logger.critical(f"Connection to Airwatch server failed : {error}")
     os.remove(lockFile)
     exit(1)
 
-# Recherche des appareils filtré sur l'utilisateur de staging
-devices = airwatch.GetDevices(stagingUser)
-
 if(devices == None):
     logger.info(f"No device found with staging user ({stagingUser}), exiting...")
     os.remove(lockFile)