Fixing issue where a property change from a feature without a popup would change popup content of the layer-level popup (another feature).
Fixing issue where a property change from a feature without a popup would change popup content of the layer-level popup (another feature).

JasonSanford/leaflet-vector-layers,kyroskoh/leaflet-vector-layers,JasonSanford/leaflet-vector-layers,kyroskoh/leaflet-vector-layers,normanb/leaflet-vector-layers,normanb/leaflet-vector-layers