psql: Improve unaligned expanded output for zero rows

This used to erroneously print an empty line.  Now it prints nothing.

src/bin/psql/print.c

@@ -439,11 +439,14 @@ print_unaligned_vertical(const printTableContent *cont, FILE *fout)
 		}
 
 		/* see above in print_unaligned_text() */
+		if (need_recordsep)
+		{
 			if (cont->opt->recordSep.separator_zero)
 				print_separator(cont->opt->recordSep, fout);
 			else
 				fputc('\n', fout);
 		}
+	}
 }