Fixed issue #2. Disabling the select tool if there aren't any graphics to select
Fixed issue #2.
Disabling the select tool if there aren't any graphics to select

Natoto/arcgis-runtime-samples-ios,sugar2010/arcgis-runtime-samples-ios,Esri/arcgis-runtime-samples-ios,ShengQiangLiu/arcgis-runtime-samples-ios,Esri/arcgis-runtime-samples-ios,Esri/arcgis-runtime-samples-ios,Natoto/arcgis-runtime-samples-ios,Esri/arcgis-runtime-samples-ios,rolson/arcgis-runtime-samples-ios,ShengQiangLiu/arcgis-runtime-samples-ios,benstoltz/arcgis-runtime-samples-ios,benstoltz/arcgis-runtime-samples-ios,sugar2010/arcgis-runtime-samples-ios