Back-end handling of row removal

When using the remove_rows method on the SpectralData class in the back-end and you set the "operator" to "==", it will clear out the entire data frame.

System/OS: MacOS/Unix

GUI or Backend: Back-end

Impact: Back-end users. The GUI keeps you from setting "==" as an option.

CODE: `s.remove_rows(matching_values=[{"column":"lat", "operator":"=", ...: "value":38.1414339}]) Shape before removing rows: (59952, 67) Shape after removing rows: (59950, 67)

s.remove_rows(matching_values=[{"column":"lat", "operator":"==" ...: , "value":38.1414339}]) Shape before removing rows: (59950, 67) Shape after removing rows: (0, 67) `