Handle duplicate schema in send_schema by always fetching first

[andrewwhitehead]

No description provided.

[codecov-io]

Codecov Report

Merging #126 into master will decrease coverage by 0.1%.
The diff coverage is 54.83%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   73.06%   72.96%   -0.11%     
==========================================
  Files         186      186              
  Lines        7983     8000      +17     
==========================================
+ Hits         5833     5837       +4     
- Misses       2150     2163      +13

[swcurran]

Reviewed the code and ran the demo. All looks good. The method of being notified of the error is not my favourite (scan error message), but that's someone else's code...