Share autocomplete produces warning in log

[PVince81]

Steps

1. Create two users "user1" and "user2"
2. Create a folder "test"
3. Share "test" with "user1"
4. From here, observe the logs
5. Type "us" in the share with autocomplete field and wait until the dropdown appears

Expected result

No warning in log

Actual result

{"reqId":"ZZqww86BjSNPgg9Exgvk","remoteAddr":"127.0.0.1","app":"PHP","message":"Array to string conversion at \/srv\/www\/htdocs\/owncloud\/core\/ajax\/share.php#363","level":3,"time":"2015-10-27T18:47:48+00:00","method":"GET","url":"\/owncloud\/index.php\/core\/ajax\/share.php?fetch=getShareWith&search=us&limit=200&itemShares%5B0%5D%5B%5D=user1&itemType=file"}

It doesn't break any functionality, but somewhat looks like a potential programming error.

Versions

Observed on master (c309193) and also 8.4.1RC1

@rullzer @schiesbn @blizzz

[rullzer]

Ah one of my favorite files...

[rullzer]

@LukasReschke your fault! 😜 a7df23c#diff-e574f71b1f320c19e9ffb5c5322146deR280

are those weird casts really needed here?

[nickvergessen]

Oh that's an is_array, not in_array,...

FIX
IT

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