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

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

2020.09.27 21:28:48 1: PERL WARNING: Use of uninitialized value in split at ./FHEM/00_SIGNALduino.pm line 676.
2020.09.27 21:28:48 1: stacktrace:
2020.09.27 21:28:48 1:     main::__ANON__                      called by ./FHEM/00_SIGNALduino.pm (676)
2020.09.27 21:28:48 1:     main::SIGNALduino_Set_flash         called by ./FHEM/00_SIGNALduino.pm (622)
2020.09.27 21:28:48 1:     main::SIGNALduino_Set               called by fhem.pl (3812)
2020.09.27 21:28:48 1:     main::CallFn                        called by fhem.pl (1923)
2020.09.27 21:28:48 1:     main::DoSet                         called by fhem.pl (1955)
2020.09.27 21:28:48 1:     main::CommandSet                    called by fhem.pl (1255)
2020.09.27 21:28:48 1:     main::AnalyzeCommand                called by ./FHEM/01_FHEMWEB.pm (2715)
2020.09.27 21:28:48 1:     main::FW_fC                         called by ./FHEM/01_FHEMWEB.pm (984)
2020.09.27 21:28:48 1:     main::FW_answerCall                 called by ./FHEM/01_FHEMWEB.pm (592)
2020.09.27 21:28:48 1:     main::FW_Read                       called by fhem.pl (3817)
2020.09.27 21:28:48 1:     main::CallFn                        called by fhem.pl (763)

• What is the new behavior (if this is a feature change)?
  no PERL WARNING

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  no

• Other information:

• to generate this error

1. restart FHEM
2. set receivername flash ./FHEM/firmware/firmwarefile.hex
3. look at logfile

[codecov]

Codecov Report

Merging #895 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #895   +/-   ##
=======================================
  Coverage   54.21%   54.21%           
=======================================
  Files          60       60           
  Lines        7908     7908           
  Branches     1271     1271           
=======================================
  Hits         4287     4287           
  Misses       2829     2829           
  Partials      792      792           

Flag	Coverage Δ
#fhem	91.37% <ø> (ø)
#modules	91.37% <ø> (ø)
#perl	91.37% <ø> (ø)
#unittest	54.21% <0.00%> (ø)
#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	60.91% <0.00%> (ø)

---

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[coveralls]

Pull Request Test Coverage Report for Build 3800

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 53.749%

---

Totals
Change from base Build 3798:	0.0%
Covered Lines:	3520
Relevant Lines:	6549

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 3792

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 53.749%

---

Totals
Change from base Build 3777:	0.05%
Covered Lines:	3520
Relevant Lines:	6549

---

💛 - Coveralls

[HomeAutoUser]

@sidey79 hier musst du bitte leider den Knopf drücken weil aufgrund der anderen nicht bestandenen Checks dies für mich nicht gestattet ist.

[HomeAutoUser]

@sidey79, ich habe die Konflikte behoben und nun wärest du erneut gefragt zum "klick" :-)