Distinguish between glyphs with empty path and no path.

BUG=skia:4904

Change-Id: I065e3b4d8596b415ddaf094d7f9a4b65da64d4d4
Reviewed-on: https://skia-review.googlesource.com/117280
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Herb Derby <herb@google.com>
diff --git a/samplecode/SamplePathText.cpp b/samplecode/SamplePathText.cpp
index 30c8e63..0d04b73 100644
--- a/samplecode/SamplePathText.cpp
+++ b/samplecode/SamplePathText.cpp
@@ -29,8 +29,8 @@
         for (int i = 0; i < 52; ++i) {
             // I and l are rects on OS X ...
             char c = "aQCDEFGH7JKLMNOPBRZTUVWXYSAbcdefghijk1mnopqrstuvwxyz"[i];
-            SkGlyphID id = cache->unicharToGlyph(c);
-            cache->getScalerContext()->getPath(SkPackedGlyphID(id), &glyphPaths[i]);
+            SkPackedGlyphID id(cache->unicharToGlyph(c));
+            sk_ignore_unused_variable(cache->getScalerContext()->getPath(id, &glyphPaths[i]));
         }
 
         for (int i = 0; i < kNumPaths; ++i) {