Closed Issue: It should report error for keyvalueParser to parse "Id=" and "='value'" [1689]

It is related to bug#1458. below should not be parsed successfully:
1. abc=
2. =abc
Comments: Verified: The error messages are: "The OData path is invalid.","ExceptionMessage":"No value for key 'CustomerId' was found at 11 in segment 'CustomerId='."," {"Message":"The OData path is invalid.","ExceptionMessage":"No key name was found at 0 in segment '='CustomerId=''.","