FIX: Schematic name argument optional in edit_external_circuit method

[gmalinve]

Description

In this PR I made the schematic name as an optional argument because is not always needed to be provided.

Issue linked

Please mention the issue number or describe the problem this pull request addresses.

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
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[Samuelopez-ansys]

@gmalinve Could you modify the title of the PR to improve the readability of the changelog?

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.16%. Comparing base (eb757a3) to head (7f11ced).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6092      +/-   ##
==========================================
- Coverage   85.16%   85.16%   -0.01%     
==========================================
  Files         167      167              
  Lines       63153    63146       -7     
==========================================
- Hits        53785    53779       -6     
+ Misses       9368     9367       -1     

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[IreneWoyna-HE]

@gmalinve @Samuelopez-ansys you are the best!! ❤️

But unfortunately there's still an issue, I guess the function should read the sources_array from the netlist, now it attempts to read it from the non-existing circuit:

[error] m2d.edit_external_circuit(netlist_file_path=netlist_file)
[error] Cannot access local variable 'sources_array' where it is not associated with a value on edit_external_circuit
[error] Last Electronics Desktop Message - [error] cannot access local variable 'sources_array' where it is not associated with a value on edit_external_circuit
[error] Method arguments:
[error] netlist_file_path = C:/.../netlist1.sph
[error] **************************************************************