Added ternary condition to ignore the span tag

What does this MR do and why?

The backend renderer puts all escaped characters in a new span with a data-escaped-char attribute. These span tags are inserted by the backend and not the user, so they should be ignored by the rich text editor parser.

hence added a ternary operator (condition to ignore span tag)

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Before	After
	428200_rich_text_editor_bug.mp4

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Related to #428200 (closed)