fix media type for files without extension

[lyoshenka]

No description provided.

[codecov]

Codecov Report

Merging #1752 into master will decrease coverage by 12.27%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master    #1752       +/-   ##
===========================================
- Coverage   63.79%   51.52%   -12.28%     
===========================================
  Files         150      150               
  Lines       13644    13645        +1     
===========================================
- Hits         8704     7030     -1674     
- Misses       4940     6615     +1675

Impacted Files	Coverage Δ
lbrynet/extras/daemon/mime_types.py	100% <100%> (ø)	⬆️
lbrynet/extras/wallet/server/tx.py	0% <0%> (-100%)	⬇️
lbrynet/extras/wallet/server/db.py	0% <0%> (-97.03%)	⬇️
lbrynet/extras/wallet/server/model.py	0% <0%> (-95.84%)	⬇️
lbrynet/extras/wallet/server/coin.py	0% <0%> (-88.51%)	⬇️
lbrynet/extras/wallet/server/daemon.py	0% <0%> (-83.88%)	⬇️
lbrynet/extras/wallet/server/opcodes.py	0% <0%> (-78.05%)	⬇️
lbrynet/extras/wallet/server/block_processor.py	0% <0%> (-71.97%)	⬇️
lbrynet/extras/wallet/resolve.py	8.86% <0%> (-70.95%)	⬇️
lbrynet/extras/wallet/server/session.py	0% <0%> (-70.68%)	⬇️
... and 32 more

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