Remove mutable default from template-rendere

freqtrade/util/template_renderer.py

@@ -3,7 +3,10 @@ Jinja2 rendering utils, used to generate new strategy and configurations.
 """
 
 
-def render_template(templatefile: str, arguments: dict = {}) -> str:
+from typing import Dict
+
+
+def render_template(templatefile: str, arguments: Dict) -> str:
 
     from jinja2 import Environment, PackageLoader, select_autoescape
 

tests/utils/test_rendering_utils.py

@@ -7,7 +7,9 @@ def test_render_template_fallback():
     from jinja2.exceptions import TemplateNotFound
     with pytest.raises(TemplateNotFound):
         val = render_template(
-            templatefile='subtemplates/indicators_does-not-exist.j2',)
+            templatefile='subtemplates/indicators_does-not-exist.j2',
+            arguments={},
+        )
 
     val = render_template_with_fallback(
         templatefile='strategy_subtemplates/indicators_does-not-exist.j2',