[BUG] Bitbucket indexing fails when the repository contains JSON files

[hrachsg]

Steps to Reproduce:

1. Open a Bitbucket toolkit
2. Go to the Indexes tab
3. Run indexing for a repository that contains at least one .json file

Actual Result:
Indexing fails with the following error:
'AttributeError: 'dict' object has no attribute 'encode'

Expected Result:
Indexing should complete successfully

[epamLDadayan]

Verified on DEV env

[epamLDadayan]

Verified on Stage env