csv: handle missing line ending

vlib/encoding/csv/reader.v

@@ -77,6 +77,9 @@ fn (r mut Reader) read_line() ?string {
 				// no valid line endings found
 				return err_invalid_le
 			}
+		} else {
+			// No line ending on file
+			i = r.data.len-1
 		}
 	}
 	mut line := r.data[r.row_pos..i]