Fix #221: Returning value if convert is None

[EmmaTinten]

Fixes #221 .

Changes proposed in this pull request:

Returns the value if the converter is None.

Attention: @prkumar

[codecov]

Codecov Report

Merging #222 (ada27cf) into master (d3ee283) will decrease coverage by 0.08%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #222      +/-   ##
==========================================
- Coverage   99.91%   99.83%   -0.09%     
==========================================
  Files          44       44              
  Lines        2398     2400       +2     
  Branches      182      183       +1     
==========================================
  Hits         2396     2396              
- Misses          2        3       +1     
- Partials        0        1       +1     

Impacted Files	Coverage Δ
uplink/converters/keys.py	94.59% <33.33%> (-5.41%)	⬇️

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[prkumar]

Fixed by #231