Don't emit decimal point if there are no trailing digits (#1210)

test/format-test.cc

@@ -1453,6 +1453,7 @@ TEST(FormatterTest, FormatDouble) {
 
 TEST(FormatterTest, PrecisionRounding) {
   EXPECT_EQ("0", format("{:.0f}", 0.0));
+  EXPECT_EQ("0", format("{:.0f}", 0.01));
   EXPECT_EQ("0", format("{:.0f}", 0.1));
   EXPECT_EQ("0.000", format("{:.3f}", 0.00049));
   EXPECT_EQ("0.001", format("{:.3f}", 0.0005));