Fix error handling with new slapos.recipe.build when download fails

slapos/recipe/cmmi/__init__.py

@@ -313,7 +313,8 @@ class Recipe(object):
                 opt['shared'] = 'false'
                 downloadunpacked.Recipe(self.buildout, self.name, opt).install()
             except:
-                shutil.rmtree(compile_dir)
+                if os.path.exists(compile_dir):
+                    shutil.rmtree(compile_dir)
                 raise
         else:
             log.info('Using local source directory: %s', self.options['path'])