Tor 0.4 eventually hits "Delaying directory fetches: No running bridges" after some period of inactivity with bridges

Tor NOTICE: Delaying directory fetches: No running bridges 
Tor NOTICE: Application request when we haven't received a consensus with exits. Optimistically trying known bridges again. 
Tor NOTICE: Delaying directory fetches: No running bridges 
Tor NOTICE: Application request when we haven't received a consensus with exits. Optimistically trying known bridges again. 
Tor NOTICE: Delaying directory fetches: No running bridges 
Tor NOTICE: Application request when we haven't received a consensus with exits. Optimistically trying known bridges again.

Tested on latest Tor Browser alpha with snowflake bridge.

Trac:
Username: ArmalsLoveArmalsLife

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