Bail out if citations are to be handled, but no list of reference

src/eoatex2imxml.py

@@ -1196,13 +1196,18 @@ def find_print_bibliography(
     """
     ret_list = {}
     print_bibl_elements = xml_context_element.findall(".//EOAprintbibliography")
-    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
+
+    if len(print_bibl_elements) == 0:
+        logging.error("No EOAprintbibliography found. Maybe you commented it out? Exiting")
+        sys.exit(0)
+    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
 
 def bib_keywords_sanity_check(
         keyword_to_print_bibl_el,