Re-initialized ordered list index when no current index available

[amantoux]

Fixes #527

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.71%. Comparing base (9703426) to head (99d755f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../fleather/lib/src/widgets/editable_text_block.dart	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #528      +/-   ##
==========================================
+ Coverage   88.69%   88.71%   +0.01%     
==========================================
  Files          63       63              
  Lines       10856    10857       +1     
==========================================
+ Hits         9629     9632       +3     
+ Misses       1227     1225       -2     

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[Amir-P]

LGTM. Can you please create an issue to fix the behavior as this only prevents the exception but the underlying issue is still there. @amantoux