Polymer/Closure: fix bug in script that generates Closure GYP

third_party/polymer/v1_0/generate_gyp.sh

Index: third_party/polymer/v1_0/generate_gyp.sh
diff --git a/third_party/polymer/v1_0/generate_gyp.sh b/third_party/polymer/v1_0/generate_gyp.sh
index 9c4be84221ad01e398cea360fb54efa92a7578f5..1d25aaaccfbada8cdcf813845a9277a54723ad74 100755
--- a/third_party/polymer/v1_0/generate_gyp.sh
+++ b/third_party/polymer/v1_0/generate_gyp.sh
@@ -8,8 +8,16 @@ dirs=$(find components-chromium -type d | grep -v 'components-chromium/polymer')
 for dir in $dirs; do
   htmls=$(\ls $dir/*.html 2>/dev/null)
   if [ "$htmls" ]; then
-    echo "Creating $dir/compiled_resources2.gyp"
-    ../../../tools/polymer/generate_compiled_resources_gyp.py $htmls > \
-        "$dir/compiled_resources2.gyp"
+    echo "Analyzing $dir"
+    gyp_file="$dir/compiled_resources2.gyp"
+    content=$(../../../tools/polymer/generate_compiled_resources_gyp.py $htmls)
+    if [ "$content" ]; then
+      echo "Writing $gyp_file"
+      echo "$content" > "$gyp_file"
+    elif [ -f "$gyp_file" ]; then
+      echo "Removing $gyp_file"
+      rm "$gyp_file"
+    fi
+    echo
   fi
 done