fix(formatter): fix IndexError while adding indentation to attributes

[ruanmed]

solves issue with boolean attributes at the start of tags. closes #290

Pull Request Check List

Resolves: #290

• [x] Added tests for changed code.
• [ ] Updated documentation for changed code.

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[codecov[bot]]

Codecov Report

Merging #326 (a3ccc19) into dev (40fdd8c) will decrease coverage by 0.11%. The diff coverage is 50.00%.

:exclamation: Current head a3ccc19 differs from pull request most recent head 183c4fc. Consider uploading reports for the commit 183c4fc to get more accurate results

@@            Coverage Diff             @@
##              dev     #326      +/-   ##
==========================================
- Coverage   96.09%   95.97%   -0.12%     
==========================================
  Files          15       15              
  Lines         769      771       +2     
  Branches      167      172       +5     
==========================================
+ Hits          739      740       +1     
  Misses         23       23              
- Partials        7        8       +1     

Impacted Files	Coverage Δ
src/djlint/formatter/attributes.py	98.80% <50.00%> (-1.20%)	:arrow_down:

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[christopherpickering]

Thanks @ruanmed !

[christopherpickering]

:tada: This PR is included in version 1.9.5 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: