mhttpd expand_env() is broken

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Issue #183 resolved
dd1 created an issue

mhttpd expand_env() is broken and leaves garbage text appended it’s output. i.e. in the case “$MIDAS_DIR” env.vairable is not defined, expand_env(“$MIDAS_DIR”) returns “$MIDAS_DIR/garbage test”. This garbage text is written to midas.log, then is returned by cm_msg_retrieve2() where it breaks web page processing because web browser requires json strings to be valid UTF8. This bug showed up in the EMMA DAQ station. Both midas-2019-03 release and head of develop have this bug. I have a fix that needs to be retested and commited to both branches. K.O.

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