Redis [BUG] Bitcount doesn't return error for missing end parameter if key is missing

Describe the bug

BITCOUNT is documented as

BITCOUNT key [start end [BYTE | BIT]]

When start is specified but end is missing (a syntax error), the command returns ERR syntax error when the key exists, but returns 0 if the key is missing.

To reproduce

$ redis-server --version
Redis server v=7.0.7 sha=00000000:0 malloc=jemalloc-5.2.1 bits=64 build=2260280010e18db8

BITCOUNT missing 0

Expected behavior

ERR syntax error when end is missing, irrespective of whether the key exists or not.

Comment From: enjoy-binbin

thanks for the report, bitpos also has this problem