erp5_corporate_identity: just return empty page instead of crash if content is empty

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/Base_viewAsLetter.py

@@ -81,6 +81,9 @@ else:
   letter_version = "001"
   letter_reference = letter.getReference()
 
+if not letter_content:
+  return
+
 # overrides for tests
 if override_batch_mode:
   letter_modification_date = DateTime("1976-11-04")

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/WebPage_viewAsBook.py

@@ -69,6 +69,8 @@ book_relative_url = book.getRelativeUrl()
 book_prefix = pref.getPreferredCorporateIdentityTemplateBookDocumentPrefix() or "Book."
 book_rendering_fix = book.WebPage_getPdfOutputRenderingFix() or blank
 book_content = book.getTextContent()
+if not book_content:
+  return
 book_aggregate_list = []
 book_revision = book.getRevision()
 book_modification_date = book.getModificationDate()

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/WebPage_viewAsContract.py

@@ -22,6 +22,8 @@ contract_relative_url = context.getRelativeUrl()
 contract_prefix='Contract.'
 contract_rendering_fix = context.WebPage_getPdfOutputRenderingFix() or blank
 contract_content = context.getTextContent()
+if not contract_content:
+  return
 contract_aggregate_list = []
 contract_revision = context.getRevision()
 contract_modification_date = context.getModificationDate()

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/WebPage_viewAsLeaflet.py

@@ -52,6 +52,8 @@ override_batch_mode = kw.get('batch_mode')
 
 # -------------------------- Document Parameters  ------------------------------
 leaflet_content = leaflet.getTextContent()
+if not leaflet_content:
+  return
 leaflet_title = leaflet.getTitle()
 leaflet_relative_url = leaflet.getRelativeUrl()
 leaflet_language = leaflet.getLanguage()

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/WebPage_viewAsRelease.py

@@ -52,6 +52,8 @@ override_batch_mode = kw.get('batch_mode')
 
 # -------------------------- Document Parameters  ------------------------------
 release_content = release.getTextContent()
+if not release_content:
+  return
 release_title = release.getTitle()
 release_language = release.getLanguage()
 release_short_title = release.getShortTitle()

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/WebPage_viewAsSlideshow.py

@@ -172,6 +172,8 @@ doc_download = int(kw.get('document_download') or 0)
 doc_save = int(kw.get('document_save') or 0)
 doc_ooo = kw.get('remote_content') or None
 doc_content = doc_ooo or doc.getTextContent()
+if not doc_content:
+  return
 doc_is_slideshow = getSlideList(doc_content) or None
 
 override_logo_reference = kw.get('override_logo_reference', None)