do not add provider without salt

packages/anastasis-core/src/index.ts

@@ -301,6 +301,13 @@ async function getProviderInfo(
   }
   try {
     const jsonResp: EscrowConfigurationResponse = await resp.json();
+    if (!jsonResp.provider_salt) {
+      return {
+        status: "error",
+        code: TalerErrorCode.ANASTASIS_REDUCER_PROVIDER_CONFIG_FAILED,
+        hint: "provider did not have provider salt",
+      }
+    }
     return {
       status: "ok",
       http_status: 200,