v4.5.6.8 release

v4.5.6.8 had 4 bug fixes.

Significant defects addressed

• Corrected an issue preventing an editorial content type from appearing outside of the editorial content types page if it was saved with a duplicated field name.
• Corrected an issue in which invalid Dynamic Placeholder values can block editors from creating new content.
• Corrected an issue that prevented an editorial content type's internal name from being automatically updated after its name value was changed due to a validation error.
• Corrected an issue when saving an editorial content type with a nameless field that caused an error instead of a validation message.