Fix NoMethodError for blame

Vasilii Iakliushinrequested to merge
479511_fix_blame_highlighting into master

What does this MR do and why?

Contributes to #479511 (closed)

Problem

We fetch blob data and highlight data separately. It's possible when they are misaligned. The application raises NoMethodError in this case.

Solution

Verify if the highlighted line is available before accessing it.

Edited by Vasilii Iakliushin

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