added diff error message for 3+ conflicintg formatters

Author: jspaezp

pydocstringformatter/_utils/issue_template.py

@@ -22,7 +22,8 @@ def create_gh_issue_template(
         msg = f"""
 Conflicting formatters: {", ".join(formatters)}
 """
-        diff = None
+        diff = "Diff too intricate to compute for this"
+        diff += f" number of formatters ({len(formatter_names)})"
     else:
         if len(formatter_names) == 2:
             msg = f"""

tests/test_conflicting_formatters.py

@@ -46,7 +46,7 @@ def cleanup() -> None:
                 test_utils.AddBFormatter(),
                 test_utils.MakeAFormatter(),
             ],
-            ["Conflicting formatters:"],
+            ["Conflicting formatters:", "Diff too intricate to compute"],
         ),
     ],
     indirect=["patched_run"],