Search input problems

[Hajuskin]

myMPD version: 9.2.2 Describe the bug

Perform a search in the queue tab and confirm the search term with enter. The search term should disapear. Now press backspace, then this error appears: "Value length for JSON path "$.params.searchstr" is too short"

**Debug logs (please attach if it can be usefull)**
INFO     webserver API request (47): MYMPD_API_QUEUE_SEARCH
DEBUG    mympdapi  Leaving mpd idle mode
DEBUG    mympdapi  Handle request
INFO     mympdapi  MYMPD API request (47)(0) MYMPD_API_QUEUE_SEARCH: {"jsonrpc":"2.0","id":0,"method":"MYMPD_API_QUEUE_SEARCH","params":{"offset":0,"limit":250,"filter":"any","searchstr":"","cols":["Title","Artist","Album","Duration","Date","Genre"]}}
WARN     mympdapi  Value length for JSON path "$.params.searchstr" is too short
ERROR    mympdapi  Error processing method "MYMPD_API_QUEUE_SEARCH"



 mympdapi  Push response to web_server_queue for connection 47: {"jsonrpc":"2.0","id":0,"error":{"method":"MYMPD_API_QUEUE_SEARCH","facility":"general","severity":"error","message":"Value length for JSON path \"$.params.searchstr\" is too short","data":{}}}
DEBUG    mympdapi  Entering mpd idle mode

[jcorporation]

Regression of #686, is now fixed in devel. Please test.

[Hajuskin]

Works fine!