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.kt

@@ -0,0 +1,8 @@
+// ERROR: The expression cannot be a selector (occur after a dot)
+class JavaClass {
+    var v = ""
+    fun m(s: String) {
+        s.
+                this.v.
+    }
+}