Detect temporal fields of forms uploaded before upgrading to v2.0

- They can lack their FormElementModel
- They can be metadata fields
- They can have a FormElementModel without child elements

src/main/java/org/opendatakit/aggregate/query/submission/QueryByUIFilterGroup.java

@@ -148,15 +148,13 @@ public QueryByUIFilterGroup(IForm form, FilterGroup filterGroup, CompletionFlag
             super.addFilter(fem, op, compareValue);
             break;
           case JRDATETIME:
-            if (fem.getFormDataModel() == null && fem.getElementName().contains("meta-"))
+          case JRDATE:
+          case JRTIME:
+            if (isLegacyTemporalField(fem))
               super.addFilter(fem, op, compareValue);
-            else if (fem.getFormDataModel() != null)
-              super.addFilterChildren(fem, column.getChildColumnCode(), op, compareValue);
             else
-              throw new IllegalArgumentException("Unrecognized dateTime field");
+              super.addFilterChildren(fem, column.getChildColumnCode(), op, compareValue);
             break;
-          case JRDATE:
-          case JRTIME:
           case GEOPOINT:
             super.addFilterChildren(fem, column.getChildColumnCode(), op, compareValue);
             break;
@@ -166,6 +164,11 @@ else if (fem.getFormDataModel() != null)
 
   }
 
+  private boolean isLegacyTemporalField(FormElementModel fem) {
+    return fem.getFormDataModel() == null && fem.getElementName().contains("meta-")
+        || fem.getFormDataModel().getChildren().isEmpty();
+  }
+
   public Object getCompareValue(FormElementModel fem, String value) {
     switch (fem.getElementType()) {
       case BOOLEAN: