Reduce verbosity of SkGraphics::Init in default case.

src/core/SkGraphics.cpp

Index: src/core/SkGraphics.cpp
diff --git a/src/core/SkGraphics.cpp b/src/core/SkGraphics.cpp
index 51521e42b1e2189cffa45e2a9a85d7d2a7158aaa..4769ffe2ecbc7c35b1e3382eff850fa4cc80a331 100644
--- a/src/core/SkGraphics.cpp
+++ b/src/core/SkGraphics.cpp
@@ -55,8 +55,10 @@ void SkGraphics::Init() {
 #ifdef SK_DEVELOPER
     skRTConfRegistry().possiblyDumpFile();
     skRTConfRegistry().validate();
-    SkDebugf("Non-default runtime configuration options:\n");
-    skRTConfRegistry().printNonDefault( );
+    if (skRTConfRegistry().countNonDefault() > 0) {
+        SkDebugf("Non-default runtime configuration options:\n");
+        skRTConfRegistry().printNonDefault();
+    }
 #endif
 
 #ifdef BUILD_EMBOSS_TABLE