[fix] Currency: Add a retry;, when loading last UD and when the block is not found.

www/js/services/currency-services.js

@@ -98,7 +98,7 @@ angular.module('cesium.currency.services', ['ngApi', 'cesium.bma.services'])
         });
     }
 
-    function loadCurrentUD() {
+    function loadCurrentUD(res, retryCount) {
       return BMA.blockchain.stats.ud()
         .then(function(res) {
           // Special case for currency init
@@ -106,8 +106,29 @@ angular.module('cesium.currency.services', ['ngApi', 'cesium.bma.services'])
             data.currentUD = data.parameters ? data.parameters.ud0 : -1;
             return data.currentUD ;
           }
+          return _safeLoadCurrentUD(res, res.result.blocks.length - 1);
+        })
+        .catch(function(err) {
+          data.currentUD = null;
+          throw err;
+        })
+    }
+
+    /**
+     * Load the last UD, with a workaround if last block with UD is not found in the node
+     * @param res
+     * @param blockIndex
+     * @returns {*}
+     * @private
+     */
+    function _safeLoadCurrentUD(res, blockIndex) {
+      // Special case for currency init
+      if (!res.result.blocks.length || blockIndex < 0) {
+        data.currentUD = data.parameters ? data.parameters.ud0 : -1;
+        return data.currentUD ;
+      }
       else {
-            var lastBlockWithUD = res.result.blocks[res.result.blocks.length - 1];
+        var lastBlockWithUD = res.result.blocks[blockIndex];
         return BMA.blockchain.block({ block: lastBlockWithUD })
           .then(function(block){
             data.currentUD = powBase(block.dividend, block.unitbase);
@@ -115,16 +136,15 @@ angular.module('cesium.currency.services', ['ngApi', 'cesium.bma.services'])
           })
           .catch(function(err) {
             console.error("[currency] Unable to load last block with UD, with number {0}".format(lastBlockWithUD));
-                data.currentUD = null;
-                throw err;
-              });
+            if (blockIndex > 0) {
+              console.error("[currency] Retrying to load UD from a previous block...");
+              return _safeLoadCurrentUD(res, blockIndex-1);
             }
-        })
-        .catch(function(err) {
             data.currentUD = null;
             throw err;
           });
       }
+    }
 
     function getData() {