fix: handle cases where outer class is gone

Author: ishland

matcher-model/src/main/java/matcher/model/type/ClassInstance.java

@@ -187,6 +187,11 @@ public String getName(NameType type, boolean includeOuter) {
 			return getNestedName(outerClass.getName(type), ret.substring(ret.lastIndexOf('/') + 1));
 		} else { // ret is an outer name, restore pkg
 			String matchedOuterName = matchedClass.outerClass.getName(type);
+
+			if (matchedOuterName == null) {
+				return null;
+			}
+
 			int pkgEnd = matchedOuterName.lastIndexOf('/');
 			if (pkgEnd > 0) ret = matchedOuterName.substring(0, pkgEnd + 1).concat(ret);