Fix crash when no mesh router is configured (#919)
Fix crash when no mesh router is configured (#919)

* Fix crash when no mesh router is configured

This adds a check for `meshListen != ""` around the waitFunc code as we
have around the other mesh-related code parts above.

Fixes https://github.com/prometheus/alertmanager/issues/914

* Update bindata

joehandzik/alertmanager,joehandzik/alertmanager,Aloomaio/alertmanager,joehandzik/alertmanager,tyrken/alertmanager,prometheus/alertmanager,Kellel/alertmanager,Kellel/alertmanager,tyrken/alertmanager,tinytub/alertmanager,Kellel/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,Aloomaio/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,tinytub/alertmanager,tinytub/alertmanager,Aloomaio/alertmanager,GoogleCloudPlatform/alertmanager,tyrken/alertmanager,GoogleCloudPlatform/alertmanager,tyrken/alertmanager,prometheus/alertmanager