all DBDocuments are issuers

app/lib/dal/sqliteDAL/DocumentDAL.ts

 export interface DBDocument {
-  issuers?: string[]
+  issuers: string[]
 }
\ No newline at end of file

app/lib/dal/sqliteDAL/SandBox.ts

@@ -14,7 +14,7 @@ export class SandBox<T extends DBDocument> {
   
   async acceptNewSandBoxEntry(element:T, pubkey:string) {
     // Accept any document which has the exception pubkey (= the node pubkey)
-    if (element.issuers !== undefined && element.issuers.indexOf(pubkey) !== -1) {
+    if (element.issuers.indexOf(pubkey) !== -1) {
       return true;
     }
     const elements = await this.findElements()