[anjuta] build-basic-autotools: Fix rh#757236 - anjuta crashes when file doesn't belong to build configuratio

[Johannes Schmid <jhs src gnome org>]

commit 5660d6446dbcf1629434957df1acd31ba95defde
Author: Johannes Schmid <jhs gnome org>
Date:   Mon Nov 28 21:34:59 2011 +0100

    build-basic-autotools: Fix rh#757236 - anjuta crashes when file doesn't belong to build configuration.

 plugins/build-basic-autotools/build.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/plugins/build-basic-autotools/build.c b/plugins/build-basic-autotools/build.c
index 0b298f0..03004bb 100644
--- a/plugins/build-basic-autotools/build.c
+++ b/plugins/build-basic-autotools/build.c
@@ -597,6 +597,12 @@ build_is_file_built (BasicAutotoolsPlugin *plugin, GFile *file,
 
 
 	config = build_configuration_list_get_selected (plugin->configurations);
+
+	if (!config)
+	{
+		return NULL;
+	}
+	
 	vars = build_configuration_get_variables (config);
 
 	build_dir = build_file_from_file (plugin, file, &target);