Fix GEO-SGD init & send Bug (#22375)

* test=develop, fix geo Send & Init

paddle/fluid/operators/distributed/communicator.cc

@@ -433,6 +433,7 @@ void GeoSgdCommunicator::Send(const std::vector<std::string> &sparse_var_names,
       }
       GeoSgdDenseParamInit(training_scope_, old_scope_.get(), local_var_name);
     }
+    return;
   }
 
   std::shared_ptr<SparseIdsMap> ids_table = std::make_shared<SparseIdsMap>();

python/paddle/fluid/communicator.py

@@ -61,7 +61,7 @@ class Communicator(object):
                 varnames = "&".join(vs["var_names"])
                 sections = "&".join([str(v) for v in vs["sections"]])
                 endpoints = "&".join(vs["epmap"])
-                is_sparse = "1" if vs["is_sparse"] else "0"
+                is_sparse = "1" if vs["is_sparse"] == ['True'] else "0"
 
                 push_var_names.append(k)
                 envs[k] = "#".join([varnames, sections, endpoints, is_sparse])