Allow chapters without bibliography if no citekeys are found

src/eoatex2imxml.py

@@ -1229,16 +1229,20 @@ def find_print_bibliography(
     print_bibl_elements = xml_context_element.findall(".//EOAprintbibliography")
 
     if len(print_bibl_elements) == 0:
-        logging.error("No EOAprintbibliography found. Maybe you commented it out? Exiting")
-        sys.exit(0)
+        citations = xml_context_element.findall(".//citekey")
+        if len(citations) > 0:
+            logging.error("No EOAprintbibliography found, but there are citations. Maybe you commented it out? Exiting")
+            sys.exit(0)
+        else:
+            logging.info("Found chapter or publication without bibliography.")
     else:
         for print_bibl_el in print_bibl_elements:
             keyword = print_bibl_el.get("keyword")
             if keyword is not None:
                 ret_list[keyword] = print_bibl_el
             else:
                 ret_list[''] = print_bibl_el
-        return ret_list
+    return ret_list
 
 def bib_keywords_sanity_check(
         keyword_to_print_bibl_el,