issue #3536 - use FHIRConfigHelper to get fhirServer/resources

So that a missing `fhirServer/resources` property in the tenant-specific
config will fall back to the `fhirServer/resources` property group in
the default tenant config.

Signed-off-by: Lee Surprenant <lmsurpre@us.ibm.com>

Author: lmsurpre

fhir-search/src/main/java/com/ibm/fhir/search/parameters/ParametersHelper.java

@@ -18,6 +18,7 @@
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 
+import com.ibm.fhir.config.FHIRConfigHelper;
 import com.ibm.fhir.config.FHIRConfiguration;
 import com.ibm.fhir.config.FHIRRequestContext;
 import com.ibm.fhir.config.PropertyGroup;
@@ -106,8 +107,7 @@ private Map<String, Map<String, ParametersMap>> buildSearchParameterMaps() {
                         log.fine(("Computing search parameters for tenant " + tenant));
                     }
 
-                    PropertyGroup root = config.loadConfigurationForTenant(tenant);
-                    PropertyGroup rsrcsGroup = root == null ? null : root.getPropertyGroup(FHIRConfiguration.PROPERTY_RESOURCES);
+                    PropertyGroup rsrcsGroup = FHIRConfigHelper.getPropertyGroup(FHIRConfiguration.PROPERTY_RESOURCES);
                     result.put(tenant, computeTenantSPs(rsrcsGroup));
                 } catch (Exception e) {
                     log.log(Level.SEVERE, "Error while computing search parameters for tenant " + tenant, e);