* flutter: Added `EJDB2#getOptional` for convenience
* flutter: Added `EJDB2#getOptional` for convenience

Softmotions/ejdb,Softmotions/ejdb,Softmotions/ejdb,achoy/ejdb,Softmotions/ejdb,Softmotions/ejdb,achoy/ejdb,Softmotions/ejdb,Softmotions/ejdb,achoy/ejdb,Softmotions/ejdb,achoy/ejdb