launch_mac doesn't work

[elken]

Due to an expansion of the JAVA_ARGS array, it incorrectly thinks it's unbound (seems empty and unbound are the same thing for arrays in bash or something...)

Trying to run it gives

./launch_mac.sh: line 182: JAVA_ARGS[@]: unbound variable

In the exec call, fixing it is as simple as

• Change "${JAVA_ARGS[@]}" to ${JAVA_ARGS[@]+"${JAVA_ARGS[@]}"}
• Change "${MAIN_ARGS[@]}" to ${MAIN_ARGS[@]+"${MAIN_ARGS[@]}"}

And then it starts at least 😄

[idelice]

Please re-test