docs: rename ql-training-rst > ql-training

docs/language/ql-training/query-examples/java/empty-if-java-model.ql

@@ -0,0 +1,11 @@
+import java
+
+class EmptyBlock extends Block {
+  EmptyBlock() { this.getNumStmt() = 0 }
+}
+
+from IfStmt ifstmt
+where
+  ifstmt.getThen() instanceof EmptyBlock and
+  not exists(ifstmt.getElse())
+select ifstmt, "This if-statement is redundant."