Text content with more than one non-breaking space not considered blank

Most of the time text content is provided as one text string. If this text string contains a non-breaking space than this string is typically of length 1.

This use case has been detected by the projectdoc Toolbox. Unfortunately if the text was longer than one and contained only blanks or non-breaking spaces, then this test fails.

We need to detect text with of any sequence of blanks and non-breaking spaces to be detected as being blank.