return nothing if pathname is empty and empty the constants

[Wikunia]

PR Checklist

The CURRENT constants should always be reset even if the liveviewer is used without a pathname.
This fixes one point mentioned by @gpucce in #434

How did you address these issues with this PR? What methods did you use?
I return nothing in that case and call empty_CURRENT_constants

[Wikunia]

Hmm I see. I think it's more a testing bug though but will have a look later. I think we shouldn't call render and assume to have access to the stuff later on. That is kind of what emptying the constants should make sure in the first place.

[gpucce]

Hmm I see. I think it's more a testing bug though but will have a look later. I think we shouldn't call render and assume to have access to the stuff later on. That is kind of what emptying the constants should make sure in the first place.

yeah I think I get it, it happens because in the testing there are calls to functions involving vid after it has already been rendered right?

[Wikunia]

We should also empty those when we call the liveviewer which is done at the top of the render function.

[gpucce]

Did not mean to ask my own review

[Wikunia]

Haha you approved it three times now and it is still buggy 😄

[gpucce]

Haha you approved it three times now and it is still buggy 😄

I don't know how this works, I wanted to make it un-approved but apperently that is not how it works? (sorry for the mess)

Premature :D

[Wikunia]

@TheCedarPrince I'm not super sure how the liveviewer works. Is there any possibility to clear the constants after the gtk window was closed?

[codecov-commenter]

Codecov Report

Merging #442 (8425e90) into master (0ec51d5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #442   +/-   ##
=======================================
  Coverage   96.26%   96.27%           
=======================================
  Files          36       36           
  Lines        1634     1636    +2     
=======================================
+ Hits         1573     1575    +2     
  Misses         61       61           

Impacted Files	Coverage Δ
src/Javis.jl	96.08% <100.00%> (+0.03%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0ec51d5...8425e90. Read the comment docs.