Fix jenkins pipeline for branches

[mellery451]

Fixes the jenkins builds on branches - we don't have change related vars in that case. This has been tested in my fork repo.

[ripplelabs-jenkins]

Jenkins Build Summary

Built from this commit

Built at 20171219 - 17:44:28

Test Results

Build Type	Result	Status
clang.debug.unity	970 cases, 0 failed, t: 383s	PASS ✅
coverage	970 cases, 0 failed, t: 607s	PASS ✅
clang.debug.nounity	968 cases, 0 failed, t: 292s	PASS ✅
gcc.debug.unity	970 cases, 0 failed, t: 422s	PASS ✅
gcc.debug.nounity	968 cases, 0 failed, t: 308s	PASS ✅
clang.release.unity	969 cases, 0 failed, t: 467s	PASS ✅
gcc.release.unity	969 cases, 0 failed, t: 497s	PASS ✅

[seelabs]

👍

[codecov-io]

Codecov Report

Merging #2289 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #2289   +/-   ##
========================================
  Coverage    71.48%   71.48%           
========================================
  Files          697      697           
  Lines        53742    53742           
========================================
  Hits         38417    38417           
  Misses       15325    15325

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[seelabs]

In 0.90.0-b3