Try to remove default replication endpoint Issue

Issue: ARTESCA-4350

lib/Config.js

@@ -560,12 +560,12 @@ class Config extends EventEmitter {
             const { replicationEndpoints } = config;
             assert(replicationEndpoints instanceof Array, 'bad config: ' +
                 '`replicationEndpoints` property must be an array');
-            if (replicationEndpoints.length > 1) {
-                const hasDefault = replicationEndpoints.some(
-                    replicationEndpoint => replicationEndpoint.default);
-                assert(hasDefault, 'bad config: `replicationEndpoints` must ' +
-                    'contain a default endpoint');
-            }
+            // if (replicationEndpoints.length > 1) {
+            //     const hasDefault = replicationEndpoints.some(
+            //         replicationEndpoint => replicationEndpoint.default);
+            //     assert(hasDefault, 'bad config: `replicationEndpoints` must ' +
+            //         'contain a default endpoint');
+            // }
             replicationEndpoints.forEach(replicationEndpoint => {
                 assert.strictEqual(typeof replicationEndpoint, 'object',
                     'bad config: `replicationEndpoints` property must be an ' +

lib/api/apiUtils/object/getReplicationInfo.js

@@ -23,12 +23,12 @@ function _getStorageClasses(rule) {
     }
     const { replicationEndpoints } = s3config;
     // If no storage class, use the given default endpoint or the sole endpoint
-    if (replicationEndpoints.length > 1) {
+    if (replicationEndpoints.length > 0) {
         const endPoint =
-            replicationEndpoints.find(endpoint => endpoint.default);
+            replicationEndpoints.find(endpoint => endpoint.default) || replicationEndpoints[0];
         return [endPoint.site];
     }
-    return [replicationEndpoints[0].site];
+    return undefined;
 }
 
 function _getReplicationInfo(rule, replicationConfig, content, operationType,
@@ -36,6 +36,9 @@ function _getReplicationInfo(rule, replicationConfig, content, operationType,
     const storageTypes = [];
     const backends = [];
     const storageClasses = _getStorageClasses(rule);
+    if (!storageClasses) {
+        return undefined;
+    }
     storageClasses.forEach(storageClass => {
         const storageClassName =
               storageClass.endsWith(':preferred_read') ?

tests/unit/api/objectReplicationMD.js

@@ -278,6 +278,8 @@ describe('Replication object MD without bucket replication config', () => {
 });
 
 [true, false].forEach(hasStorageClass => {
+    // this may break....
+    // or need to add a test where there is no default entry in config--->which should fail indeed...
     describe('Replication object MD with bucket replication config ' +
     `${hasStorageClass ? 'with' : 'without'} storage class`, () => {
         const replicationMD = {