Merge pull request github#5195 from aschackmull/java/cwe-548-test

Java: Add empty file to test.

Author: yo-h

java/ql/test/experimental/query-tests/security/CWE-548/A.java

@@ -0,0 +1,2 @@
+public class A {
+}

java/ql/test/experimental/query-tests/security/CWE-555/A.java

@@ -0,0 +1,2 @@
+public class A {
+}