fix(routers): status 500 when malformed jdls are given #388

Job	Run time
Build wheels	1m 1s
client-generation	3m 14s
Unit test - ./extensions/gubbins/gubbins-core	1m 42s
Unit test - ./extensions/gubbins/gubbins-db	1m 40s
Unit test - ./extensions/gubbins/gubbins-routers	2m 14s
Unit test - ./extensions/gubbins/gubbins-client	1m 37s
Unit test - ./extensions/gubbins/gubbins-cli	1m 45s
build-image	2m 37s
pytest-integration	13m 49s
	29m 39s

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