Catch potential KeyErrors on bridge ID lookups in bridgedb.Main.
Catch potential KeyErrors on bridge ID lookups in bridgedb.Main.

We should catch the KeyError here, as sometimes this loop gets a bridge ID
from an extra-info descriptor and tries to lookup the bridge, causing a
KeyError on the lookup.

 * ADD try/except wrapper to catch KeyErrors on looking up bridges by ID in
   the bridges dict in bridgedb.Main.load().

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