fix(router): handle rejected promise in custom router

[bforbis]

Fixes #411

[ghost]

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[coveralls]

Coverage increased (+0.08%) to 88.13% when pulling ab10af9 on bforbis:bugfix/handled-promise-rejection-in-router into cb64266 on chimurai:master.

[chimurai]

published a new version: [email protected]

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