Catch error 500 on delete

src/sync.js

@@ -182,6 +182,16 @@ function syncKinto(client, credentials) {
             .sync({
               headers: {Authorization: `Bearer ${credential.access_token}`},
               strategy: 'manual',
+            })
+            .catch((error) => {
+              if (error.response && error.response.status === 500) {
+                // issue #827
+                return Promise.resolve({
+                  conflicts: []
+                });
+              }
+
+              throw error;
             });
       });
     })

test/unit/main.test.js

@@ -286,7 +286,7 @@ describe('Authorization', function() {
         .then(() => {
           // Verify that the notes collection was deleted.
           console.log(JSON.stringify(fetchMock.calls()));
-          chai.assert(deleted);
+          chai.assert(deleted, 'was deleted');
           return collection.getAny('singleNote');
         }).then(result => {
           // Record now needs to be synced again.