'No display name and no $DISPLAY environment variable' when analysing rods via ssh

The following is all done whilst ssh’ed into another machine.

When following the KOBRA tutorial, the code is unable to finish plotting PDF graphs from matplotlib, despite it not displaying anything on screen when done locally.

Could be a problem for people using KOBRA when ssh’ed into supercomputers.

This bug appears when usingFFEA_rod.anal_rod().plot(), FFEA_rod.rod_creator.preview_rod() and in the connection_energy_2 unit test.

Could be an easy fix as the error report is explicit.

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