[FLOSS] yajl plugin fails silently on meta-set

[Bujuhu]

As discussed in #4555

Steps to Reproduce the Problem

$ sudo kdb mount config.json user:/tests/yajl yajl
# RET: 0
$ kdb meta-set user:/tests/yajl/roots 'a' 'b'
# RET: 0  
$ kdb meta-get user:/tests/yajl/roots 'a'
Key not found
# RET: 2

Expected Result

Should either print an error on kdb meta-set user:/tests/yajl/roots 'a' 'b' and return a non 0 exit code or
kdb meta-get user:/tests/yajl/roots 'a' should return b

Actual Result

$ kdb meta-set user:/tests/yajl/roots 'a' 'b' fails silently and kdb meta-get user:/tests/yajl/roots 'a' returns a key not found error

System Information

Operating System:
Arch Linux, Kernel 5.19.13-arch1-1

kdb and plugins version

# kdb --version
KDB_VERSION: 0.9.11
SO_VERSION: 5

Relevant Source Code

yajl only checks for the array and type meta keys. All others are ignored

libelektra/src/plugins/yajl/yajl_gen.c

Line 257 in cf4b6f3

const char * meta = keyString (keyGetMeta (cur, "array"));

libelektra/src/plugins/yajl/yajl_gen.c

Line 140 in cf4b6f3

const Key * type = keyGetMeta (cur, "type");