Setting git.basedir to relative directory causes NPE

[hekonsek]

Cherry picked #1456 into 2.1.x branch as requested by @spencergibb .

[codecov]

Codecov Report

Merging #1471 into master will increase coverage by 0.82%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1471      +/-   ##
============================================
+ Coverage     77.29%   78.11%   +0.82%     
+ Complexity     1042     1010      -32     
============================================
  Files           131      120      -11     
  Lines          3827     3624     -203     
  Branches        533      516      -17     
============================================
- Hits           2958     2831     -127     
+ Misses          688      610      -78     
- Partials        181      183       +2

Impacted Files	Coverage Δ	Complexity Δ
...oud/config/server/support/AbstractScmAccessor.java	80.61% <100%> (+1.02%)	33 <0> (+1)	⬆️
...ent/EnvironmentEncryptorEnvironmentRepository.java	90.47% <0%> (-2.86%)	8% <0%> (-4%)
.../environment/AbstractScmEnvironmentRepository.java	89.47% <0%> (-0.53%)	4% <0%> (-1%)
...erver/environment/NativeEnvironmentRepository.java	84.89% <0%> (-0.11%)	44% <0%> (-1%)
...nfig/server/environment/EnvironmentController.java	89.58% <0%> (-0.11%)	40% <0%> (-3%)
...g/monitor/EnvironmentMonitorAutoConfiguration.java	100% <0%> (ø)	2% <0%> (ø)	⬇️
...environment/MultipleJGitEnvironmentRepository.java	75.83% <0%> (ø)	35% <0%> (ø)	⬇️
...nt/EnvironmentRepositoryPropertySourceLocator.java	100% <0%> (ø)	3% <0%> (ø)	⬇️
...oud/config/server/resource/ResourceController.java	84.9% <0%> (ø)	20% <0%> (ø)	⬇️
...amework/cloud/config/client/ConfigClientWatch.java	35% <0%> (ø)	6% <0%> (ø)	⬇️
... and 25 more

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