MySQL: Don't offer empty enum value in edit

MySQL errors if there's an invalid value on the first row of INSERT or
UPDATE, regardless of the sql_mode variable.

adminer/include/adminer.inc.php

@@ -710,7 +710,7 @@ class Adminer {
 		if ($field["type"] == "enum") {
 			return (isset($_GET["select"]) ? "<label><input type='radio'$attrs value='-1' checked><i>" . lang('original') . "</i></label> " : "")
 				. ($field["null"] ? "<label><input type='radio'$attrs value=''" . ($value !== null || isset($_GET["select"]) ? "" : " checked") . "><i>NULL</i></label> " : "")
-				. enum_input("radio", $attrs, $field, $value, 0) // 0 - empty
+				. enum_input("radio", $attrs, $field, $value, $value === 0 ? 0 : null) // 0 - empty value
 			;
 		}
 		return "";

changes.txt

@@ -1,6 +1,7 @@
 Adminer 4.17.0-dev:
 Hide index column options by default
 MySQL, PostgreSQL, MS SQL: Support CHECK constraint
+MySQL: Don't offer empty enum value in edit
 PostgreSQL: Link user defined types
 PostgreSQL: Constraint enum values in editing (bug #270)
 SQLite: Show all supported pragmas in Variables

todo.txt

@@ -14,7 +14,6 @@ Skinnable plus.gif and other images - http://typo3.org/extensions/repository/vie
 ? Branch binary_compile: LZW compression of all texts can save 11 KB, using chars 127-255 in minification can save 1 KB
 
 https://github.com/vrana/adminer/compare/master...adminneo-org:adminneo:main
-MySQL: Do not show 'empty' enum value in strict mode
 MySQL: Print comments of stored procedures and functions
 Add drag-n-drop moving of rows in table editing
 PostgreSQL: Show list of schemas in database