Feat: Better error log to showcase why solution failed for python.

[sharmas1ddharth]

Is your feature request related to a problem? Please describe.
It's really difficult to understand why solver failed as there is only solution failed text not the reason or exception

Describe the solution you'd like
It will be better if we get to see the exception or error causing solving failed

[triceo]

@sharmas1ddharth Thanks for the report!

We'd like to understand the situation in which this happens; we keep improving our error messages with every release. Please provide steps to reproduce your issue and we'll take a look when time permits.

[sharmas1ddharth]

In VRP optimisation,
I have 3 locations and one depot when fetching distance and duration from our custom distance time matrix.
first one is depot and other are locations.

locations_set1 = [Location(77.27926863862307, 28.5261602315649), Location(73.0578158, 19.2522977), Location(73.0578158, 19.2522977), Location(78.9475437, 25.7242883)]

locations_set2 = [Location(77.27926863862307, 28.5261602315649), Location(77.27926863862307, 28.5261602315649), Location(73.0578158, 19.2522977), Location(73.0578158, 19.2522977), Location(78.9475437, 25.7242883)]

locations_set3 = [Location(77.27926863862307, 28.5261602315649), Location(73.0578158, 19.2522977), Location(73.0578158, 19.2522977), Location(78.9475437, 25.7242883), Location(77.27926863862307, 28.5261602315649)]

locations_set1 and locations_set3 is not working and throwing solving failed but locations_set2 is working.

I hope you understand my issue, It will be helpful to know why solving is failing.