PR: Avoid iterating over non-dict objects if conda responds with errors

[dpizetta]

Description of Changes

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

Issue(s) Resolved

Fixes #22007.

Traceback (most recent call last):
  File "/XXX/lib/python3.11/site-packages/spyder/workers/updates.py", line 119, in start
    channel, channel_url = get_spyder_conda_channel()
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/XXX/lib/python3.11/site-packages/spyder/utils/conda.py", line 235, in get_spyder_conda_channel
    if package_info["name"] == 'spyder':
       ~~~~~~~~~~~~^^^^^^^^
TypeError: string indices must be integers, not 'str'

Reponse from conda:

{'caused_by': 'None', 'error': "CondaError: Expected exactly one egg-infodirectory in 'XXX', via egg-link 'lib/python3.11/site-packages/XXX.egg-link'. Instead found: ('XXX.egg-info', 'XXX.egg-info'). These are often left over from legacy operations that did not clean up correctly. Please remove all but one of these.", 'exception_name': 'CondaError', 'exception_type': "<class 'conda.CondaError'>", 'message': "Expected exactly oneegg-info directory in '/XXX', via egg-link 'lib/python3.11/site-packages/XXX.egg-link'. Instead found: ('XXX.egg-info', 'XXX.egg-info'). These are often left over from legacy operations that did not clean up correctly. Please remove all but one of these."}

Affirmation

By submitting this Pull Request or typing my (user)name below,
I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct: dpizetta

[ccordoba12]

Hey @dpizetta, thanks for your help with this! You did this change against our master branch but it seems you're using Spyder 5. So, you probably would like to see it in our next version (5.5.5), right?

If that's the case, would you be ok with us moving this change to our 5.x branch?

[dpizetta]

Hey @ccordoba12, sure, would be great to have in the v5 for our use here. Thanks for the heads up

[ccordoba12]

Thanks for your help with this @dpizetta!