mhttpd crash in mjson encoder if connected remotely

by mistake MIDAS_SERVER_HOST was set and mhttpd connected to the experiment through the mserver.

then it promptly crashed in the json encoder which calls db_lock_database() which complains about missing semaphore (cannot lock odb remotely!).

the result was very confusing.

to prevent the confusion, I should add a check in mhttpd and refuse to run if connected remotely. (maybe do same for mlogger?).

the correct fix is in the json encoder - I should not call db_lock_database() if connected remotely!

K.O.

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