Catch SourceNotFound error for domains transfer-in

[mglagola]

This catches an error when a user does not have billing info on file and attempts to transfer-in a domain.

[codecov-io]

Codecov Report

Merging #1879 into canary will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           canary   #1879      +/-   ##
=========================================
+ Coverage    6.34%   6.38%   +0.03%     
=========================================
  Files          93      93              
  Lines        4048    4041       -7     
=========================================
+ Hits          257     258       +1     
+ Misses       3791    3783       -8

Impacted Files	Coverage Δ
src/util/read-metadata.js	100% <0%> (ø)	⬆️
src/util/hash.js	100% <0%> (ø)	⬆️
src/util/error.js	100% <0%> (ø)	⬆️
src/util/get-files.js	96.89% <0%> (+5.36%)	⬆️
src/util/get-project-name.js	100% <0%> (+9.09%)	⬆️

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