try catch on drupal graphql schemas fetch

src/schema/external/drupal.js

@@ -2,11 +2,13 @@ import request from "superagent";
 import { introspectSchema, wrapSchema, RenameTypes } from "@graphql-tools/wrap";
 import { print } from "graphql";
 import config from "../../config";
+import { log } from "dbc-node-logger";
 
 const executor = async ({ document, variables }) => {
   const query = print(document);
   const url = config.datasources.backend.url;
   const fetchResult = await request.post(url).send({ query, variables });
+
   return await fetchResult.body;
 };
 
@@ -17,11 +19,18 @@ const typeNameMap = {
 };
 
 export default async () => {
-  const executableSchema = wrapSchema({
-    schema: await introspectSchema(executor),
-    executor,
-    transforms: [new RenameTypes((name) => typeNameMap[name] || name)],
-  });
+  try {
+    const executableSchema = wrapSchema({
+      schema: await introspectSchema(executor),
+      executor,
+      transforms: [new RenameTypes((name) => typeNameMap[name] || name)],
+    });
 
-  return executableSchema;
+    return executableSchema;
+  } catch (e) {
+    log.error("Error fetching graphql schema from drupal backend", {
+      response: e.message,
+    });
+    return false;
+  }
 };

src/schemaLoader.js

@@ -112,11 +112,12 @@ export async function getExecutableSchema({
     }
 
     // Merge external and internal schemas
-    const mergedSchema = loadExternal
-      ? mergeSchemas({
-          schemas: [externalSchema, internalSchema],
-        })
-      : internalSchema;
+    const mergedSchema =
+      loadExternal && externalSchema
+        ? mergeSchemas({
+            schemas: [externalSchema, internalSchema],
+          })
+        : internalSchema;
 
     // Filter schema according to permissions of Smaug client
     // If no valid accessToken is given (no smaug client), we allow to introspect