AttributeError when credentials file exists but is empty

[lc-cbot]

Bug Description

When the ~/.limacharlie credentials file exists but is empty (0 bytes), the SDK crashes with an unhandled AttributeError instead of providing a helpful error message.

Steps to Reproduce

1. Create an empty credentials file: touch ~/.limacharlie
2. Run any limacharlie CLI command (e.g., limacharlie org list)

Expected Behavior

The SDK should detect the empty/invalid credentials file and display a helpful error message, e.g.:

"Credentials file ~/.limacharlie is empty or corrupted. Run 'limacharlie auth login' to reconfigure."

Actual Behavior

Traceback (most recent call last):
  File "/home/user/.local/bin/limacharlie", line 5, in <module>
    from limacharlie.__main__ import main
  File "/home/user/.local/lib/python3.11/site-packages/limacharlie/__init__.py", line 54, in <module>
    GLOBAL_OID, GLOBAL_UID, GLOBAL_API_KEY = _getEnvironmentCreds( _lcEnv )
                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.11/site-packages/limacharlie/__init__.py", line 27, in _getEnvironmentCreds
    oid = credsFile.get( 'oid', None )
          ^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'get'

Root Cause

In __init__.py, _getEnvironmentCreds reads the credentials file and parses it. When the file is empty, the parser returns None, but the code assumes it will always be a dict and calls .get() on it without a null check.

Suggested Fix

Add a guard after parsing the credentials file:

if credsFile is None:
    credsFile = {}

Or raise a descriptive error prompting the user to re-authenticate.

Environment

• limacharlie version: 5.0.2
• Python version: 3.11
• OS: Linux