Don't convert null value into 'null' string.

[keiwanmosaddegh]

Context

Some websites could have the tag that satisfies a certain parser, but still miss the actual value of it. These values are null. However, the value getter in lib/src/parser/util.dart (link here), does not check for this, but converts any value to String. Since toString has the ability to even convert null into String ("null"), the job is considered done, and no other parser will be able to attempt actually getting a proper value.

Solution

Before converting value to String, check if value is null.

Example

• Try a very famous Swedish E-Commerce website Åhlens.
• The imageUrl will be "null" (extracted from og:image), and will omit the HtmlMetaParser result, which will have found the correct URL.

[MattyBoy4444]

Any chance this will make it in soon?

[sur950]

Thanks for the PR @keiwanmosaddegh

I got a little bandwidth now, Will try to close whatever I can and include this PR as well in my coming version. CC @MattyBoy4444