Code coverage improvement test ServiceError handling
Code coverage improvement test ServiceError handling

For this purpose we create a wrong request with M=0 and verify
that serviceError is correctly raised when calling Result_element class

Signed-off-by: EstherLerouzic <9136e9bbec0a09a1685b8ebbe677b6c9b26e8f18@orange.com>

Telecominfraproject/gnpy