Create an exception in case of an error due to spectrum problem
eg if spectrum request is not correct
if values are not correct.
use it instead of exit
Signed-off-by: EstherLerouzic <esther.lerouzic@orange.com>
in case there is no possible disjoint path with the added constraints
(most of the time due to an inconsistant user request)
Signed-off-by: EstherLerouzic <esther.lerouzic@orange.com>
Once the actual config-parsing code start raising these exceptions
instead of directly calling sys.exit(), the user experience would
deteriorate due to raw exception traces. There's little value in the
trace itself, so just wrap the whole config loading with pretty error
formatting.
We still do not point to a specific place where that error is defined
(such as a line/column in a given JSON file) because that information is
already lost by the time we perform these checks.
Also, these checks are largely open-coded ad-hoc stuff. Some required
items are not covered, raising KeyError instead. We should get a formal
schema for these...
