rpc: fixed missing read blocks (#1581)

* rpc: fixed missing read blocks
* rpc: storage: restored old behavior
* rpc: allocating 0 bytes for empty read

Co-authored-by: あく <alleteam@gmail.com>

applications/rpc/rpc_storage.c

@@ -320,16 +320,21 @@ static void rpc_system_storage_read_process(const PB_Main* request, void* contex
 
                 response->has_next = fs_operation_success && (size_left > 0);
             } else {
-                response->content.storage_read_response.has_file = false;
+                response->content.storage_read_response.file.data =
+                    malloc(PB_BYTES_ARRAY_T_ALLOCSIZE(0));
+                response->content.storage_read_response.file.data->size = 0;
+                response->content.storage_read_response.has_file = true;
                 response->has_next = false;
                 fs_operation_success = true;
             }
+
+            if(fs_operation_success) {
+                rpc_send_and_release(session, response);
+            }
         } while((size_left != 0) && fs_operation_success);
     }
 
-    if(fs_operation_success) {
-        rpc_send_and_release(session, response);
-    } else {
+    if(!fs_operation_success) {
         rpc_send_and_release_empty(
             session, request->command_id, rpc_system_storage_get_file_error(file));
     }