Master fix - PERL WARNING

[HomeAutoUser]

• Please check if the PR fulfills these requirements

• Tests for the changes have been added / modified (needed for for bug fixes / features)
• commandref has been added / updated (needed for bug fixes / features)
• CHANGED has been updated (needed for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Bug fix PERL WARING

• What is the current behavior? (You can also link to an open issue here)

1. set eventlogging 0
2. delete eventlogging

2020.12.01 23:15:05 3: signalESP8266: Attr, Disable eventlogging
2020.12.01 23:15:19 1: PERL WARNING: Argument "" isn't numeric in numeric eq (==) at ./FHEM/00_SIGNALduino.pm line 3014.
2020.12.01 23:15:19 1: stacktrace:
2020.12.01 23:15:19 1:     main::__ANON__                      called by ./FHEM/00_SIGNALduino.pm (3014)
2020.12.01 23:15:19 1:     main::SIGNALduino_Attr              called by fhem.pl (3810)
2020.12.01 23:15:19 1:     main::CallFn                        called by fhem.pl (2309)
2020.12.01 23:15:19 1:     main::CommandDeleteAttr             called by fhem.pl (1247)
2020.12.01 23:15:19 1:     main::AnalyzeCommand                called by ./FHEM/01_FHEMWEB.pm (2715)
2020.12.01 23:15:19 1:     main::FW_fC                         called by ./FHEM/01_FHEMWEB.pm (987)
2020.12.01 23:15:19 1:     main::FW_answerCall                 called by ./FHEM/01_FHEMWEB.pm (592)
2020.12.01 23:15:19 1:     main::FW_Read                       called by fhem.pl (3810)
2020.12.01 23:15:19 1:     main::CallFn                        called by fhem.pl (755)
2020.12.01 23:15:19 3: signalESP8266: Attr, Disable eventlogging

• What is the new behavior (if this is a feature change)?

2020.12.01 23:15:05 3: signalESP8266: Attr, Disable eventlogging
2020.12.01 23:15:19 3: signalESP8266: Attr, Disable eventlogging

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  none

• Other information:

[codecov]

Codecov Report

Merging #907 (d62615c) into master (d77bb5b) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #907      +/-   ##
==========================================
- Coverage   54.27%   54.22%   -0.06%     
==========================================
  Files          62       62              
  Lines        7958     7958              
  Branches     1280     1280              
==========================================
- Hits         4319     4315       -4     
- Misses       2843     2847       +4     
  Partials      796      796              

Flag	Coverage Δ
fhem	91.37% <ø> (ø)
modules	91.37% <ø> (ø)
perl	91.37% <ø> (ø)
unittest	54.22% <0.00%> (-0.06%)	⬇️
unittests	91.37% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
FHEM/00_SIGNALduino.pm	60.85% <0.00%> (-0.22%)	⬇️

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[coveralls]

Pull Request Test Coverage Report for Build 3929

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 53.608%

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Totals
Change from base Build 3928:	0.1%
Covered Lines:	3521
Relevant Lines:	6568

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💛 - Coveralls