Eliminated non-essential warning log in mailto:// parsing

[caronc]

Description:

Related issue (if applicable): #1207

Eliminated non-essential warning in the mailto:// parsing

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@1207-mailto-warnings?

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  "mailto://credentials/"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.36%. Comparing base (130edde) to head (33e1ff2).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1216      +/-   ##
==========================================
- Coverage   99.36%   99.36%   -0.01%     
==========================================
  Files         148      148              
  Lines       20682    20680       -2     
  Branches     4042     4042              
==========================================
- Hits        20551    20549       -2     
  Misses        121      121              
  Partials       10       10              

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