Key is null error

[petrov9268]

remove repo changes that were mistakenly merged in #12, leave all other changes plus fix error in latest release

• add T_OpExpr to condition to fix missing key in a functions with a where clause that have operation
• added two test cases that call two new functions 6 times to check that no error occurred
• code cleanup: remove trailing spaces from redis_fdw.c and remove localization from expected
• fix -Wimplicit-fallthrough warning
• fix mistake in 1.0.8 upgrade script