Define "check" before running checkAPI()

Traceback (most recent call last):
  File "./dumpgenerator.py", line 2294, in <module>
    main()
  File "./dumpgenerator.py", line 2239, in main
    config, other = getParameters(params=params)
  File "./dumpgenerator.py", line 1587, in getParameters
    if api and check:
UnboundLocalError: local variable 'check' referenced before assignment

dumpgenerator.py

@@ -1575,6 +1575,7 @@ def getParameters(params=[]):
         retry = 0
         maxretries = args.retries
         retrydelay = 20
+        check = None
         while retry < maxretries:
             try:
                 check = checkAPI(api=api, session=session)