Fix nested issue with cpts

[joa-quim]

No description provided.

[codecov-io]

Codecov Report

Merging #293 into master will decrease coverage by 0.02%.
The diff coverage is 60%.

@@            Coverage Diff            @@
##           master    #293      +/-   ##
=========================================
- Coverage   93.92%   93.9%   -0.03%     
=========================================
  Files          80      80              
  Lines        3654    3658       +4     
=========================================
+ Hits         3432    3435       +3     
- Misses        222     223       +1

Impacted Files	Coverage Δ
src/pstext.jl	100% <ø> (ø)	⬆️
src/common_options.jl	96.04% <100%> (ø)	⬆️
src/psxy.jl	97.21% <100%> (+0.34%)	⬆️
src/gmt_main.jl	80.89% <33.33%> (-0.17%)	⬇️

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