Analyze Buildings.DHC.Plants.Combined.Examples.AllElectricCWStorage with OpenModelica

[mwetter]

The model Buildings.DHC.Plants.Combined.Examples.AllElectricCWStorage works locally with OMC 1.23.0, but fails on travis.
The local simulation has a large log file due to

Non-Linear Solver try to handle a problem with a called assert.
Division by zero roughness / diameter in function context
Division by zero roughness / diameter in function context
Division by zero roughness / diameter in function context
Homotopy solver total pivot: Matrix (nearly) singular at initialization.
Continuing anyway. For more information please use -lv LOG_NLS_V.
under-determined linear system not solvable!

although it recovers and simulates to the end. This issue is to see what causes these problems.