Add error condition for duplicated labels

[alanocallaghan]

As discussed here: https://github.com/talgalili/heatmaply/issues/155

This doesn't alter existing behaviour, just gives a more intelligible error message

[codecov-io]

Codecov Report

Merging #72 into master will increase coverage by 0.53%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage   37.92%   38.46%   +0.53%     
==========================================
  Files          51       50       -1     
  Lines        4021     3913     -108     
==========================================
- Hits         1525     1505      -20     
+ Misses       2496     2408      -88

Impacted Files	Coverage Δ
R/seriate_dendrogram.R	0% <0%> (ø)	:arrow_up:
R/branches_attr_by.R	0% <0%> (-17.9%)	:arrow_down:
R/set.dendrogram.R	78.04% <0%> (-1.5%)	:arrow_down:
R/colored_bars.R	0% <0%> (ø)	:arrow_up:
R/colored_dots.R

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[talgalili]

Hi @Alanocallaghan Thank you for the PR.

This seems to cause an error in one of the tests, is it something you could fix? (I suspect that the test needs to be amended)

[alanocallaghan]

Sure, I'll have another look tomorrow, was just putting it together quickly

[talgalili]

Hi @Alanocallaghan I see Travis reports a failure in the test:

 ══ testthat results  ═══════════════════════════════════════════════════════════
  OK: 358 SKIPPED: 0 FAILED: 1
  1. Failure: seriate fails with duplicated labels (@test-rotate.R#97) 

  Error: testthat unit tests failed

Could you please have a look and fix it?

[alanocallaghan]

I can't figure this out, it works locally (though other tests break instead). Anyway not a major issue so I'll close