fix(pane,session,server): Return False if type mismatched

[tony]

Follow up to #505

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (c729584) 88.79% compared to head (d55b1a4) 88.65%.

❗ Current head d55b1a4 differs from pull request most recent head 1372f44. Consider uploading reports for the commit 1372f44 to get more accurate results

Files	Patch %	Lines
src/libtmux/server.py	0.00%	3 Missing ⚠️
src/libtmux/pane.py	33.33%	1 Missing and 1 partial ⚠️
src/libtmux/session.py	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #510      +/-   ##
==========================================
- Coverage   88.79%   88.65%   -0.14%     
==========================================
  Files          35       35              
  Lines        3515     3518       +3     
  Branches      485      488       +3     
==========================================
- Hits         3121     3119       -2     
- Misses        285      288       +3     
- Partials      109      111       +2     

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