[PR] Bug 919: Ensure clearText() produces valid XML by a dding default empty paragraph [poi]

waterWang opened a new pull request, #1192:
URL: https://github.com/apache/poi/pull/1192

   ## Description
   
   When `clearText()` is called on a text shape (e.g., `XSLFTextBox`), it removes all paragraphs from the `CTTextBody`. If the shape is saved without adding new content, the resulting OOXML document is invalid because the OOXML spec requires at least one paragraph in a text body.
   
   ## Fix
   
   After clearing all paragraphs, add a default empty paragraph to ensure the XML remains valid. This allows `clearText()` to be used safely without immediately adding new content.
   
   ## Test
   
   Added `testClearTextWithEmptyParagraph()` that:
   1. Creates a slide with a text box
   2. Calls `clearText()`
   3. Saves and re-reads the presentation
   4. Verifies the shape has at least one empty paragraph
   5. Verifies the text is empty string
   
   Fixes #919


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