Merge pull request #2222 from node-red/no-empty-examples

Ignore empty examples directories (don't add to import menu)

packages/node_modules/@node-red/registry/lib/library.js

@@ -51,7 +51,6 @@ function getFlowsFromPath(path) {
                     }
                     i++;
                 })
-
                 resolve(result);
             })
         });
@@ -61,6 +60,7 @@ function getFlowsFromPath(path) {
 function addNodeExamplesDir(module,path) {
     exampleRoots[module] = path;
     return getFlowsFromPath(path).then(function(result) {
+        if (JSON.stringify(result).indexOf('{"f":') === -1) { return; }
         exampleFlows = exampleFlows||{};
         exampleFlows[module] = result;
     });