Fix/grant submission

[octavioamu]

Description

• Fix failing to blank screen when any exception
• Add support for ens domains > to eth address

Refers/Fixes

@owocki in thread https://gitcoincore.slack.com/archives/CAXQ7PT60/p1578152474013700

Testing

https://share.vidyard.com/watch/vavVsvYhYZsTPU7gcyR4s1?

[codecov]

Codecov Report

Merging #5716 into stable will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           stable    #5716      +/-   ##
==========================================
+ Coverage   29.97%   29.98%   +<.01%     
==========================================
  Files         249      249              
  Lines       21448    21446       -2     
  Branches     3111     3110       -1     
==========================================
  Hits         6430     6430              
+ Misses      14733    14731       -2     
  Partials      285      285

Impacted Files	Coverage Δ
app/grants/views.py	14.93% <0%> (+0.07%)	⬆️

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