[gnome-builder] cargo: pass empty flags

[Christian Hergert <chergert src gnome org>]

commit 103536c32d3e11d1ca4dbc7cb24d7933c9f01d00
Author: Christian Hergert <chergert redhat com>
Date:   Fri Oct 28 18:46:37 2016 -0700

    cargo: pass empty flags
    
    We really ought to make this (default 0) in introspection.

 plugins/cargo/cargo_plugin.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/cargo/cargo_plugin.py b/plugins/cargo/cargo_plugin.py
index d8579f7..20c064c 100644
--- a/plugins/cargo/cargo_plugin.py
+++ b/plugins/cargo/cargo_plugin.py
@@ -47,7 +47,7 @@ class CargoBuildSystem(Ide.Object, Ide.BuildSystem, Gio.AsyncInitable):
                 return
 
             # Maybe this is a directory with a Cargo.toml
-            if self.props.project_file.query_file_type() == Gio.FileType.DIRECTORY:
+            if self.props.project_file.query_file_type(0) == Gio.FileType.DIRECTORY:
                 child = self.props.project_file.get_child('Cargo.toml')
                 if child.query_exists(None):
                     self.props.project_file = child