Fix annoying popups when editing incomplete macros

[Chilledheart]

Sometimes libclang returns invalid ranges causing ycm in trouble.

No log is recorded (both of ycmd and ycm) for this inconvenice.

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This change is 

[puremourning]

@MergifyIO rebase

[mergify[bot]]

rebase

✅ Branch has been successfully rebased

[puremourning]

Thanks!

[mergify[bot]]

Thanks for sending a PR!

[codecov[bot]]

Codecov Report

Merging #1633 (ec9fe6c) into master (b08e7a9) will increase coverage by 0.00%. The diff coverage is 81.81%.

@@           Coverage Diff           @@
##           master    #1633   +/-   ##
=======================================
  Coverage   96.09%   96.09%           
=======================================
  Files          90       90           
  Lines        8035     8044    +9     
  Branches      164      164           
=======================================
+ Hits         7721     7730    +9     
  Misses        262      262           
  Partials       52       52           

[mergify[bot]]

Thanks for sending a PR!

[mergify[bot]]

Thanks for sending a PR!