Fix Parchment unnamed parameters

Parchment parameters can have a null (or potentially even blank) name
for a parameter, while still having a javadoc description. To account
for this, use the SRG name if the name is null or blank.

Author: Jonathing

src/main/java/net/minecraftforge/mcmaven/impl/mappings/ParchmentMappings.java

@@ -281,6 +281,7 @@ private static SideData gather(IMappingFile obf2srg, IMappingFile obf2moj, Parch
     }
 
     private static void add(Map<String, Info> map, String orig, String mapped, ParchmentData.Element element) {
+        mapped = mapped != null && !mapped.isBlank() ? mapped : orig;
         var desc = element == null ? null : getJavadocs(element.javadoc);
         if (!orig.equals(mapped) || desc != null)
             map.put(orig, new Info(mapped, desc));