Added safe_var function

filter_plugins/safe_var.py

@@ -0,0 +1,27 @@
+# file: filter_plugins/safe_var.py
+
+from jinja2 import Undefined
+
+def safe_var(value):
+    """
+    Returns the original value unless it is None or Jinja2‐Undefined.
+    Catches all exceptions and returns an empty string on error.
+    """
+    try:
+        # If the value is an Undefined from Jinja2, treat it as missing
+        if isinstance(value, Undefined):
+            return ''
+        # Treat None as missing as well
+        if value is None:
+            return ''
+        # Otherwise return the actual value
+        return value
+    except Exception:
+        # Catch any other errors and return empty string
+        return ''
+
+class FilterModule(object):
+    def filters(self):
+        return {
+            'safe_var': safe_var
+        }