Do not use empty plugin name as language name

When leaving off the 'name = "..."' attribute from the @plugin, the name
is actually set to "", not null, so we need to test for that too.

Author: ctrueden

src/main/java/org/scijava/script/AbstractScriptLanguage.java

@@ -106,7 +106,7 @@ public String getEngineName() {
 	@Override
 	public String getLanguageName() {
 		final String name = getInfo().getName();
-		return name != null ? name : inferNameFromClassName();
+		return name != null && !name.isEmpty() ? name : inferNameFromClassName();
 	}
 
 	@Override

src/main/java/org/scijava/script/AdaptedScriptLanguage.java

@@ -105,7 +105,7 @@ public String getLanguageName() {
 		final PluginInfo<?> info = getInfo();
 		if (info == null) return null;
 		final String name = info.getName();
-		return name != null ? name : base.getLanguageName();
+		return name != null && !name.isEmpty() ? name : base.getLanguageName();
 	}
 
 	@Override