fix bug where null ratings throw error in frontend

frontend/src/components/result.tsx

@@ -24,6 +24,7 @@ export default function Result(props : ResultProps) {
                             >
                                 {props.name}
                             </Typography>
+                            {props.rating &&
                                 <Rating 
                                     readOnly
                                     value={props.rating.value * 5.0 / props.rating.maximum}
@@ -31,6 +32,7 @@ export default function Result(props : ResultProps) {
                                     size='small'
                                     sx={{top: '2px'}}
                                 />
+                            }
                         </>
                     } 
                     secondary={props.shortDescription}

frontend/src/models/solicitorSummary.ts

@@ -2,7 +2,7 @@ export default interface SolicitorSummary {
     name : string,
     shortDescription : string | null,
     id : string,
-    rating : Rating
+    rating : Rating | null
 };
 
 export interface Rating {