gridSourceSet type; zoneForLoc returns optional

src/main/java/gov/usgs/earthquake/nshmp/model/GridLoader.java

@@ -306,7 +306,11 @@ class GridLoader {
           ? record.getOptionalDouble(Key.MMAX)
           : OptionalDouble.empty();
 
-      String gridId = zoneForLocation(loc);
+      Optional<String> gridIdOpt = zoneForLocation(loc);
+      // if (gridIdOpt.isEmpty()) {
+      // return;
+      // }
+      String gridId = gridIdOpt.orElseThrow();
 
       FeatureData featureData = dataMap.get(gridId);
       featureData.locations.add(loc);
@@ -366,12 +370,15 @@ class GridLoader {
       return Map.copyOf(modelMfds);
     }
 
-    private String zoneForLocation(Location location) {
+    // TODO there are probably going to be curcumstances under which
+    // it is unreasonable to expect that every single point in a smoothed
+    // seismicity model is contained in a polygon
+    private Optional<String> zoneForLocation(Location location) {
       return featureMap.values().stream()
           .filter(grid -> grid.contains(location))
           .map(grid -> grid.name)
-          .findFirst()
-          .orElseThrow();
+          .findFirst();
+      // .orElseThrow();
     }
   }
 
@@ -416,6 +423,7 @@ class GridLoader {
   }
 
   static GridSourceSet createGrid(
+      SourceType type,
       SourceConfig.Grid config,
       Feature feature,
       List<Location> locations,
@@ -433,6 +441,7 @@ class GridLoader {
         .weight(weight)
         .gmms(gmms);
     builder.gridConfig(config);
+    builder.type(type);
     props.getDouble(Key.STRIKE).ifPresent(builder::strike);
 
     // System.out.println(mfds.get(0).properties().type());