fix(ble/bluedroid): Allow 0 length indications (IDFGH-13783)

[nebkat]

Description

Fixes bug introduced in d4b7be4#diff-d62647524ad053d398406d804b8ac728ce5d74473823025ef907c5d895c3d54d

Related

3.4.7.2. ATT_HANDLE_VALUE_IND allows length 0.

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[nebkat]

@esp-zhp Has this incorrectly been marked as Done or is it merged internally?