Fix Google Drive checkout crash.

ID-based protocol don't have path.

Change-Id: I4f1dd4f77870d1c77bbd3cd015dd88396003ed6d

libcmis/UnpackedTarball_cmis.mk

@@ -13,7 +13,9 @@ $(eval $(call gb_UnpackedTarball_set_tarball,cmis,$(CMIS_TARBALL)))
 
 $(eval $(call gb_UnpackedTarball_set_patchlevel,cmis,0))
 
-$(eval $(call gb_UnpackedTarball_add_patches,cmis,libcmis/libcmis-0.4.1.patch))
+$(eval $(call gb_UnpackedTarball_add_patches,cmis, \
+						libcmis/libcmis-0.4.1.patch \
+						libcmis/libcmis-0.4.1-empty-path.patch))
 
 ifeq ($(OS)$(COM),WNTMSC)
 $(eval $(call gb_UnpackedTarball_add_patches,cmis,libcmis/boost-win.patch))

libcmis/libcmis-0.4.1-empty-path.patch

+diff --git src/libcmis/document.cxx src/libcmis/document.cxx
+index 1af0d63..7ecfd24 100644
+--- src/libcmis/document.cxx
++++ src/libcmis/document.cxx
+@@ -44,6 +44,8 @@ namespace libcmis
+                  it != parents.end(); ++it )
+             {
+                 string path = ( *it )->getPath( );
++                if ( path.empty() )
++                    continue;
+                 if ( path[path.size() - 1] != '/' )
+                     path += "/";
+                 path += getName( );