fix(Table): do not skip empty lines in csv reader

fix #280

Author: landonreed

src/main/java/com/conveyal/gtfs/loader/JdbcGtfsLoader.java

@@ -332,7 +332,7 @@ private int loadInternal (Table table) throws Exception {
         int keyFieldIndex = table.getKeyFieldIndex(fields);
         // Create separate fields array with filtered list that does not include null values (for duplicate headers or
         // ID field). This is solely used to construct the table and array of values to load.
-        Field[] cleanFields = Arrays.stream(fields).filter(field -> field != null).toArray(Field[]::new);
+        Field[] cleanFields = Arrays.stream(fields).filter(Objects::nonNull).toArray(Field[]::new);
         if (cleanFields.length == 0) {
             // Do not create the table if there are no valid fields.
             errorStorage.storeError(NewGTFSError.forTable(table, TABLE_MISSING_COLUMN_HEADERS));

src/main/java/com/conveyal/gtfs/loader/Table.java

@@ -520,6 +520,9 @@ public CsvReader getCsvReader(ZipFile zipFile, SQLErrorStorage sqlErrorStorage)
             // but the GTFS spec says that "files that include the UTF byte order mark are acceptable".
             InputStream bomInputStream = new BOMInputStream(zipInputStream);
             CsvReader csvReader = new CsvReader(bomInputStream, ',', Charset.forName("UTF8"));
+            // Don't skip empty records (this is set to true by default on CsvReader. We want to check for empty records
+            // during table load, so that they are logged as validation issues (WRONG_NUMBER_OF_FIELDS).
+            csvReader.setSkipEmptyRecords(false);
             csvReader.readHeaders();
             return csvReader;
         } catch (IOException e) {

src/test/java/com/conveyal/gtfs/GTFSTest.java

@@ -141,6 +141,13 @@ public void canLoadFeedWithBadDates () {
             new ErrorExpectation(NewGTFSErrorType.REFERENTIAL_INTEGRITY),
             new ErrorExpectation(NewGTFSErrorType.DATE_FORMAT),
             new ErrorExpectation(NewGTFSErrorType.DATE_FORMAT),
+            // The below "wrong number of fields" errors are for empty new lines
+            // found in the file.
+            new ErrorExpectation(NewGTFSErrorType.WRONG_NUMBER_OF_FIELDS),
+            new ErrorExpectation(NewGTFSErrorType.WRONG_NUMBER_OF_FIELDS),
+            new ErrorExpectation(NewGTFSErrorType.WRONG_NUMBER_OF_FIELDS),
+            new ErrorExpectation(NewGTFSErrorType.WRONG_NUMBER_OF_FIELDS),
+            new ErrorExpectation(NewGTFSErrorType.WRONG_NUMBER_OF_FIELDS),
             new ErrorExpectation(NewGTFSErrorType.REFERENTIAL_INTEGRITY),
             new ErrorExpectation(NewGTFSErrorType.ROUTE_LONG_NAME_CONTAINS_SHORT_NAME),
             new ErrorExpectation(NewGTFSErrorType.FEED_TRAVEL_TIMES_ROUNDED),