Perl Warning: uninitialized value ... bei bestimmten Modulnamen

Hallo,

wir sind im Besitz eines Modules https://github.com/RFD-FHEM/SIGNALduino_TOOL/blob/pre-release/FHEM/88_SIGNALduino_TOOL.pm wo ich die Metadaten eingebunden habe.
Lange habe ich nach der Ursache gesucht von folgendem Fehler

```
2021.05.19 22:37:31 1: PERL WARNING: Use of uninitialized value in string ne at FHEM/Meta.pm line 1875.
2021.05.19 22:37:31 1: stacktrace:
2021.05.19 22:37:31 1: main::__ANON__ called by FHEM/Meta.pm (1875)
2021.05.19 22:37:31 1: FHEM::Meta::__GetMetadata called by FHEM/Meta.pm (1109)
2021.05.19 22:37:31 1: FHEM::Meta::__PutMetadata called by FHEM/Meta.pm (673)
2021.05.19 22:37:31 1: FHEM::Meta::InitMod called by ./FHEM/88_SIGNALduino_TOOL.pm (123)
2021.05.19 22:37:31 1: main::SIGNALduino_TOOL_Initialize called by fhem.pl (2692)
2021.05.19 22:37:31 1: (eval) called by fhem.pl (2675)
2021.05.19 22:37:31 1: main::CommandReload called by fhem.pl (2037)
2021.05.19 22:37:31 1: main::LoadModule called by fhem.pl (2102)
2021.05.19 22:37:31 1: main::CommandDefine called by fhem.pl (1265)
2021.05.19 22:37:31 1: main::AnalyzeCommand called by fhem.pl (1116)
2021.05.19 22:37:31 1: main::AnalyzeCommandChain called by fhem.pl (1403)
2021.05.19 22:37:31 1: main::CommandInclude called by fhem.pl (619)
2021.05.19 22:37:31 1: PERL WARNING: Use of uninitialized value in string eq at FHEM/Meta.pm line 2115.
2021.05.19 22:37:31 1: stacktrace:
2021.05.19 22:37:31 1: main::__ANON__ called by FHEM/Meta.pm (2115)
2021.05.19 22:37:31 1: FHEM::Meta::__GetMetadata called by FHEM/Meta.pm (1109)
2021.05.19 22:37:31 1: FHEM::Meta::__PutMetadata called by FHEM/Meta.pm (673)
2021.05.19 22:37:31 1: FHEM::Meta::InitMod called by ./FHEM/88_SIGNALduino_TOOL.pm (123)
2021.05.19 22:37:31 1: main::SIGNALduino_TOOL_Initialize called by fhem.pl (2692)
2021.05.19 22:37:31 1: (eval) called by fhem.pl (2675)
2021.05.19 22:37:31 1: main::CommandReload called by fhem.pl (2037)
2021.05.19 22:37:31 1: main::LoadModule called by fhem.pl (2102)
2021.05.19 22:37:31 1: main::CommandDefine called by fhem.pl (1265)
2021.05.19 22:37:31 1: main::AnalyzeCommand called by fhem.pl (1116)
2021.05.19 22:37:31 1: main::AnalyzeCommandChain called by fhem.pl (1403)
2021.05.19 22:37:31 1: main::CommandInclude called by fhem.pl (619)
2021.05.19 22:37:31 1: PERL WARNING: Use of uninitialized value in string eq at FHEM/Meta.pm line 2393.
2021.05.19 22:37:31 1: stacktrace:
2021.05.19 22:37:31 1: main::__ANON__ called by FHEM/Meta.pm (2393)
2021.05.19 22:37:31 1: FHEM::Meta::__GetMetadata called by FHEM/Meta.pm (1109)
2021.05.19 22:37:31 1: FHEM::Meta::__PutMetadata called by FHEM/Meta.pm (673)
2021.05.19 22:37:31 1: FHEM::Meta::InitMod called by ./FHEM/88_SIGNALduino_TOOL.pm (123)
2021.05.19 22:37:31 1: main::SIGNALduino_TOOL_Initialize called by fhem.pl (2692)
2021.05.19 22:37:31 1: (eval) called by fhem.pl (2675)
2021.05.19 22:37:31 1: main::CommandReload called by fhem.pl (2037)
2021.05.19 22:37:31 1: main::LoadModule called by fhem.pl (2102)
2021.05.19 22:37:31 1: main::CommandDefine called by fhem.pl (1265)
2021.05.19 22:37:31 1: main::AnalyzeCommand called by fhem.pl (1116)
2021.05.19 22:37:31 1: main::AnalyzeCommandChain called by fhem.pl (1403)
2021.05.19 22:37:31 1: main::CommandInclude called by fhem.pl (619)
2021.05.19 22:37:31 1: PERL WARNING: Use of uninitialized value in string ne at FHEM/Meta.pm line 2396.
2021.05.19 22:37:31 1: stacktrace:
2021.05.19 22:37:31 1: main::__ANON__ called by FHEM/Meta.pm (2393)
2021.05.19 22:37:31 1: FHEM::Meta::__GetMetadata called by FHEM/Meta.pm (1109)
2021.05.19 22:37:31 1: FHEM::Meta::__PutMetadata called by FHEM/Meta.pm (673)
2021.05.19 22:37:31 1: FHEM::Meta::InitMod called by ./FHEM/88_SIGNALduino_TOOL.pm (123)
2021.05.19 22:37:31 1: main::SIGNALduino_TOOL_Initialize called by fhem.pl (2692)
2021.05.19 22:37:31 1: (eval) called by fhem.pl (2675)
2021.05.19 22:37:31 1: main::CommandReload called by fhem.pl (2037)
2021.05.19 22:37:31 1: main::LoadModule called by fhem.pl (2102)
2021.05.19 22:37:31 1: main::CommandDefine called by fhem.pl (1265)
2021.05.19 22:37:31 1: main::AnalyzeCommand called by fhem.pl (1116)
2021.05.19 22:37:31 1: main::AnalyzeCommandChain called by fhem.pl (1403)
2021.05.19 22:37:31 1: main::CommandInclude called by fhem.pl (619)
```

bis ich dahinter kam, **wenn ich das Modul umbenenne** in 88_SIGNALduinoTOOL.pm mit Namensanpassungen, so erhalte ich den Fehler nicht.

Meine Vermutung, das hier ein RegEx nicht klarkommt.

MfG