Ignore wikidata claims without datavalue

Logic/Web/Wikidata.ts

@@ -47,8 +47,10 @@ export default class Wikidata {
             const claimsList: any[] = entity.claims[claimId]
             const values = new Set<string>()
             for (const claim of claimsList) {
-                const value = claim.mainsnak.datavalue.value;
-                values.add(value)
+                const value = claim.mainsnak?.datavalueq?.value;
+                if(value !== undefined){
+                    values.add(value)
+                }
             }
             claims.set(claimId, values);
         }

test/ImageProvider.spec.ts

@@ -57,6 +57,10 @@ export default class ImageProviderSpec extends T {
                 expects("https://commons.wikimedia.org/wiki/Special:FilePath/File%3ABrugge_Leeuwstraat_zonder_nummer_Leeuwbrug_-_119334_-_onroerenderfgoed.jpg?width=500&height=400",{
                     image:"File:Brugge_Leeuwstraat_zonder_nummer_Leeuwbrug_-_119334_-_onroerenderfgoed.jpg"
                 }, "WikimediaImageProvider")
+
+                expects("https://commons.wikimedia.org/wiki/Special:FilePath/File%3APapageno_Jef_Claerhout.jpg?width=500&height=400",{
+                    "wikimedia_commons":	"File:Papageno_Jef_Claerhout.jpg"
+                }, "WikimediaImageProvider")
                
             
             }]