Fix issue with inner classes and empty package name.

jadx-core/src/main/java/jadx/core/dex/info/ClassInfo.java

@@ -89,6 +89,10 @@ public final class ClassInfo {
 		int sep = clsName.lastIndexOf('$');
 		if (canBeInner && sep > 0 && sep != clsName.length() - 1) {
 			String parClsName = pkg + "." + clsName.substring(0, sep);
+			if(pkg.length() == 0) {
+				parClsName = clsName.substring(0, sep);
+			}
+
 			parentClass = fromName(dex, parClsName);
 			clsName = clsName.substring(sep + 1);
 		} else {