Don't a log warning when remapping @shadow without a target class.

Author: modmuss50

build.gradle

@@ -6,7 +6,7 @@ plugins {
 	id 'com.github.johnrengelman.shadow' version '8.1.1'
 }
 
-version = '0.11.0'
+version = '0.11.1'
 
 def ENV = System.getenv()
 version = version + (ENV.GITHUB_ACTIONS ? "" : "+local")

src/main/java/net/fabricmc/tinyremapper/extension/mixin/hard/util/ConvertibleMappable.java

@@ -58,6 +58,10 @@ protected Stream<String> mapMultiTarget(IConvertibleString name, String desc) {
 
 	@Override
 	protected Optional<String> getMappedName() {
+		if (targets.isEmpty()) {
+			return Optional.empty();
+		}
+
 		List<String> collection = mapMultiTarget(getName(), getDesc())
 				.collect(Collectors.toList());