Modified handling pvd files when the triangulation is not present on all processes.

[shreyas02]

As shown in issue #171

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (6694d26) to head (87fa43e).
Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Visualization.jl	0.00%	24 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #174    +/-   ##
=======================================
  Coverage    0.00%   0.00%            
=======================================
  Files          11      11            
  Lines        3249    3349   +100     
=======================================
- Misses       3249    3349   +100     

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