Fix for KT-14205

If detected unfinished expression it passed through, added warning on action "Convert Java to Kotlin", if Java files contains syntax errors.

j2k/testData/fileOrElement/issues/unfinishedReferenceExpression.java

@@ -0,0 +1,7 @@
+public class JavaClass {
+    public String v = "";
+    public void m(String s) {
+        s.
+        this.v.
+    }
+}