Fix support for Visual Studio 2010 Express projects.

pylib/gyp/MSVSNew.py

Index: pylib/gyp/MSVSNew.py
diff --git a/pylib/gyp/MSVSNew.py b/pylib/gyp/MSVSNew.py
index 667e531c99ff530d83b71ee061fd05f1830e95fa..845dcb0639d7568efafd74ed20b16d275e13cc6c 100644
--- a/pylib/gyp/MSVSNew.py
+++ b/pylib/gyp/MSVSNew.py
@@ -325,14 +325,15 @@ class MSVSSolution:
     f.write('\tEndGlobalSection\r\n')
 
     # Folder mappings
-    # TODO(rspangler): Should omit this section if there are no folders
-    f.write('\tGlobalSection(NestedProjects) = preSolution\r\n')
-    for e in all_entries:
-      if not isinstance(e, MSVSFolder):
-        continue        # Does not apply to projects, only folders
-      for subentry in e.entries:
-        f.write('\t\t%s = %s\r\n' % (subentry.get_guid(), e.get_guid()))
-    f.write('\tEndGlobalSection\r\n')
+    # Omit this section if there are no folders
+    if any([e.entries for e in all_entries if isinstance(e, MSVSFolder)]):
+      f.write('\tGlobalSection(NestedProjects) = preSolution\r\n')
+      for e in all_entries:
+        if not isinstance(e, MSVSFolder):
+          continue        # Does not apply to projects, only folders
+        for subentry in e.entries:
+          f.write('\t\t%s = %s\r\n' % (subentry.get_guid(), e.get_guid()))
+      f.write('\tEndGlobalSection\r\n')
 
     f.write('EndGlobal\r\n')