[3.14] gh-146092: Fix error handling in _BINARY_OP_ADD_FLOAT opcode (#146119)

Fix error handling in _PyFloat_FromDouble_ConsumeInputs() used by
_BINARY_OP_ADD_FLOAT, _BINARY_OP_SUBTRACT_FLOAT and
_BINARY_OP_MULTIPLY_FLOAT opcodes. PyStackRef_FromPyObjectSteal()
must not be called with a NULL pointer.

Fix also _BINARY_OP_INPLACE_ADD_UNICODE opcode.