[DomCrawler] [HttpFoundation] Make `Content-Type` attributes identification case-insensitive
bug #9378 [DomCrawler] [HttpFoundation] Make `Content-Type` attributes identification case-insensitive (matthieuprat)

This PR was merged into the 2.2 branch.

Discussion
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[DomCrawler] [HttpFoundation] Make `Content-Type` attributes identification case-insensitive

According to [section 3.7 of RFC 2616][], media-type attribute names in the `Content-Type` header are case-insensitive.
Therefore, identification of the `text` type and the `charset` parameter in the `Content-Type` header should be case-insensitive.

[section 3.7 of RFC 2616]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.7

Commits
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17a2d66 [DomCrawler] [HttpFoundation] Make `Content-Type` attributes identification case-insensitive
[Form] Fixed: The "data" option is taken into account even if it is NULL
Fixed the error handling when decoding invalid XML to avoid a Warning
bug #9391 [Serializer] Fixed the error handling when decoding invalid XML to avoid a Warning (stof)

This PR was merged into the 2.2 branch.

Discussion
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[Serializer] Fixed the error handling when decoding invalid XML to avoid a Warning

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Without the exception being thrown here, the call to ``simplexml_import_dom`` throws a warning saying ``Invalid Nodetype to import``.
This has been reported by @Tobion after we refactored FOSRestBundle to use this XmlEncoder instead of a duplication of a previous version of the class: https://github.com/FriendsOfSymfony/FOSRestBundle/pull/583/files#r7221045

Commits
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b2550b9 Fixed the error handling when decoding invalid XML to avoid a Warning
bug #9388 [Form] Fixed: The "data" option is taken into account even if it is NULL (bschussek)

This PR was merged into the 2.2 branch.

Discussion
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[Form] Fixed: The "data" option is taken into account even if it is NULL

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
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c1a3eb3 [Form] Fixed: The "data" option is taken into account even if it is NULL
fixed CS
Merge branch '2.2' into 2.3

* 2.2:
  fixed CS
  Fixed the error handling when decoding invalid XML to avoid a Warning
  [Form] Fixed: The "data" option is taken into account even if it is NULL
  [DomCrawler] [HttpFoundation] Make `Content-Type` attributes identification case-insensitive

Conflicts:
	src/Symfony/Component/Form/Extension/Core/Type/FormType.php