fixing melt model support for entities with no attributes due to inheritance

[rquedas]

Description

Added guard condition to support entities without attributes due to inheritance.

Type of Change

• Bug Fix

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 15.49%. Comparing base (00d0c6f) to head (0d11e21).
Report is 51 commits behind head on main.

Files	Patch %	Lines
cmd/melt/model.go	0.00%	7 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##             main     #368       +/-   ##
===========================================
- Coverage   26.88%   15.49%   -11.39%     
===========================================
  Files          44      142       +98     
  Lines        4564    11370     +6806     
===========================================
+ Hits         1227     1762      +535     
- Misses       3242     9480     +6238     
- Partials       95      128       +33     

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