Check DBUS_SESSION_BUS_ADDRESS and give more meaningful errors

[bynect]

Addresses #1386

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 65.14%. Comparing base (9d3c91a) to head (3fb71a6).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/dbus.c	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1389      +/-   ##
==========================================
+ Coverage   65.11%   65.14%   +0.02%     
==========================================
  Files          50       50              
  Lines        8649     8652       +3     
  Branches     1021     1022       +1     
==========================================
+ Hits         5632     5636       +4     
+ Misses       3017     3016       -1     

Flag	Coverage Δ
unittests	65.14% <0.00%> (+0.02%)	⬆️

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[bynect]

I also updated the wiki

[bynect]

@bebehei do you think this can be merged?

[bebehei]

I don't see any problems. But I'm not confident anymore using "not seeing any problems" as a good indicator for having good code in this project.

[bynect]

I don't see any problems. But I'm not confident anymore using "not seeing any problems" as a good indicator for having good code in this project.

I'll just think of this as a LGTM moment then 😆