Revision 22220: 55_DWD_OpenData.pm: fix $warncellId uninitialized, fix forecast update ...

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Revision 22220: 55_DWD_OpenData.pm: fix $warncellId uninitialized, fix forecast update ...

55_DWD_OpenData.pm: fix $warncellId uninitialized, fix forecast update error handling (Forum: #83097 msg #1065333)

Source: Revision 22220: 55_DWD_OpenData.pm: fix $warncellId uninitialized, fix forecast update ...