Adds a check to make sure an expected comma separated list can be parsed to a list

src/main/java/net/knarcraft/ffmpegconverter/parser/ConverterArgument.java

@@ -1,5 +1,7 @@
 package net.knarcraft.ffmpegconverter.parser;
 
+import net.knarcraft.ffmpegconverter.utility.ListUtil;
+
 /**
  * A class representing a command argument
  */
@@ -66,6 +68,7 @@ public class ConverterArgument {
                 String lower = value.toLowerCase();
                 return lower.equals("true") || lower.equals("false");
             case COMMA_SEPARATED_LIST:
+                ListUtil.getListFromCommaSeparatedString(value);
                 return true;
             case STRING:
                 return true;