Adds more checks before deleting temporary files.

src/google/protobuf/compiler/command_line_interface_unittest.cc

@@ -252,7 +252,9 @@ void CommandLineInterfaceTest::SetUp() {
 
 void CommandLineInterfaceTest::TearDown() {
   // Delete the temp directory.
-  File::DeleteRecursively(temp_directory_, NULL, NULL);
+  if (File::Exists(temp_directory_)) {
+    File::DeleteRecursively(temp_directory_, NULL, NULL);
+  }
 
   // Delete all the MockCodeGenerators.
   for (int i = 0; i < mock_generators_to_delete_.size(); i++) {

src/google/protobuf/compiler/importer_unittest.cc

@@ -348,7 +348,9 @@ class DiskSourceTreeTest : public testing::Test {
 
   virtual void TearDown() {
     for (int i = 0; i < dirnames_.size(); i++) {
-      File::DeleteRecursively(dirnames_[i], NULL, NULL);
+      if (File::Exists(dirnames_[i])) {
+        File::DeleteRecursively(dirnames_[i], NULL, NULL);
+      }
     }
   }
 

src/google/protobuf/testing/file.cc

@@ -133,6 +133,8 @@ bool File::RecursivelyCreateDir(const string& path, int mode) {
 
 void File::DeleteRecursively(const string& name,
                              void* dummy1, void* dummy2) {
+  if (name.empty()) return;
+
   // We don't care too much about error checking here since this is only used
   // in tests to delete temporary directories that are under /tmp anyway.