Fixed issue #63 writing for NULL values using writeRow()

Author: iliaal

ChangeLog

@@ -1,4 +1,5 @@
 [2014-??-??] - Version 1.0
+	* Fixed issue #63 writing for NULL values using writeRow()
 	* Added excel.skip_empty INI setting that allows null values to be skipped, if set to 2 the empty strings will be skipped as well
 	* Added Sheet::setRightToLeft() and Sheet::setRightToLeft() methods that specifies whether the sheet in is "right to left" display mode
 	* Added Book::isTemplate() and Book::setTemplate() methods for detecting xltx files and converting from xlsx to xltx and vice versa

excel.c

@@ -2308,7 +2308,12 @@ static zend_bool php_excel_write_cell(SheetHandle sheet, BookHandle book, int ro
 			if (INI_INT("excel.ini_skip_empty") > 0) {
 				return 1;
 			}
-			return xlSheetWriteBlank(sheet, row, col, format);
+			if (!format) {
+				FormatHandle fmt = xlBookAddFormat(book, NULL);
+				return xlSheetWriteBlank(sheet, row, col, fmt);
+			} else {
+				return xlSheetWriteBlank(sheet, row, col, format);
+			}
 
 		case IS_LONG:
 			if (dtype == PHP_EXCEL_DATE) {