Made analysis type optional to support minimal test sigmets/airmets. Note that there's currently no way to differentiate between standard sigmets, volcanic ash sigmets or tropical cyclone sigmets when using short test sigmets without meteorological information. Follow up: https://github.com/fmidev/fmi-avi-messageconverter-tac/issues/184.
Made analysis type optional to support minimal test sigmets/airmets. Note that there's currently no way to differentiate between standard sigmets, volcanic ash sigmets or tropical cyclone sigmets when using short test sigmets without meteorological information. Follow up: https://github.com/fmidev/fmi-avi-messageconverter-tac/issues/184.