Fix AllowThouthands for decimal

Author: xplicit

src/ServiceStack.Text/Support/StringSegmentExtensions.cs

@@ -393,6 +393,9 @@ public static decimal ParseDecimal(this StringSegment value, bool allowThousands
                         {
                             state = ParseState.TrailingWhite;
                         }
+                        else if (allowThousands && c == ',')
+                        {
+                        }
                         else
                         {
                             throw new FormatException(BadFormat);

tests/ServiceStack.Text.Tests/Support/StringSegmentParse.cs

@@ -69,6 +69,10 @@ public void Can_parse_decimal()
             Assert.That(new StringSegment("2.e2").ParseDecimal(), Is.EqualTo(200m));
             //Assert.Throws<FormatException>(() => new StringSegment(".e2").ParseDecimal());
 
+            //allow thouthands
+            Assert.That(new StringSegment("1,234.5678").ParseDecimal(true), Is.EqualTo(1234.5678m));
+            Assert.Throws<FormatException>(() => new StringSegment(",1234.5678").ParseDecimal(true));
+
         }
 
         [Test]