Spaces around = in $(format-json) template function could cause a crash.
The fix of the issue also introduced an enhancement, from now on spaces are allowed around the = operator, so the following $(format-json) template function calls are all valid:

$(format-json foo =alma)
$(format-json foo= alma)
$(format-json foo = alma)
$(format-json foo=\" alma \")
$(format-json foo= \" alma \")
$(format-json foo1= alma foo2 =korte foo3 = szilva foo4 = \" meggy \" foo5=\"\")

Please note the usage of the escaped strings like \" meggy \", and the (escaped and) quoted form that used for an empty value \"\", the latter is a breaking change as earlier an expression like key= led to a json key-value pair with an empty value {"key":""} that will not work anymore.

Fixes: #5065

Signed-off-by: Hofi [email protected]