Handle JsonException thrown from JSON parser. (#286)

We were allowing some exceptions to escape, which would cause a crash of the reader.

source/LottieReader/Serialization/LottieCompositionReader.cs

@@ -123,6 +123,8 @@ namespace Microsoft.Toolkit.Uwp.UI.Lottie.LottieData.Serialization
             var markers = Array.Empty<Marker>();
             Dictionary<string, GenericDataObject> extraData = null;
 
+            try
+            {
                 reader.ConsumeToken();
 
                 while (reader.Read())
@@ -272,6 +274,12 @@ namespace Microsoft.Toolkit.Uwp.UI.Lottie.LottieData.Serialization
                             throw reader.ThrowUnexpectedToken();
                     }
                 }
+            }
+            catch (JsonException e)
+            {
+                // Re-throw errors from the JSON parser using our own exception.
+                throw Exception(e.Message);
+            }
 
             throw EofException;
         }

source/LottieReader/Serialization/Reader.cs

@@ -48,19 +48,12 @@ namespace Microsoft.Toolkit.Uwp.UI.Lottie.LottieData.Serialization
 
             // Consumes a token from the stream.
             internal void ConsumeToken()
-            {
-                try
             {
                 if (!_jsonReader.Read())
                 {
                     throw EofException;
                 }
             }
-                catch (JsonException e)
-                {
-                    throw Exception(e.Message);
-                }
-            }
 
             internal void Skip() => _jsonReader.Skip();