fix(spp_gis): skip MapTiler raster style override when no API key

renderMap() was overriding the OSM fallback style with a MapTiler
style reference when defaultRaster was set, even without an API key.
Guard the raster style override behind mapTilerKey check.

Author: jeremi

spp_gis/static/src/js/views/gis/gis_renderer/gis_renderer.esm.js

@@ -415,7 +415,7 @@ export class GisRenderer extends Component {
 
         let defaultMapStyle = this.getMapStyle();
 
-        if (this.defaultRaster) {
+        if (this.mapTilerKey && this.defaultRaster) {
             if (this.defaultRaster.raster_style.includes("-")) {
                 const rasterStyleArray = this.defaultRaster.raster_style
                     .toUpperCase()