Do not fail upon encountering a bogus range.

When parsing an ID range file, do not fail if we encounter a single
range with an invalid definition.

Instead, wait until the entire file has been parsed, and fail if we
could not find a single valid range.

core/src/main/java/org/incenp/obofoundry/idrange/IDRangePolicyParser.java

@@ -110,13 +110,16 @@ public IIDRangePolicy parse() throws IDRangePolicyException {
 
             for ( OWLDatatypeDefinitionAxiom ax : ont.getDatatypeDefinitions(datatype) ) {
                 IDRange range = ax.getDataRange().accept(visitor);
-                if ( range == null ) {
-                    throw new IDRangePolicyException("Invalid range definition");
+                if ( range != null ) {
+                    policy.ranges.put(name, range);
                 }
-                policy.ranges.put(name, range);
             }
         }
 
+        if ( policy.ranges.isEmpty() ) {
+            throw new IDRangePolicyException("No correct ranges found in ID range policy");
+        }
+
         return policy;
     }