Fixed DFR3 service's out of index error

CHANGELOG.md

@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [Unrelased]
+
+### Fixed
+- Out of index error in dfr3 service's property conversion when the rule is not found [#555](https://github.com/IN-CORE/pyincore/issues/555)
+
 ## [1.18.1] - 2024-04-30
 
 ### Changed

pyincore/dfr3service.py

@@ -395,10 +395,17 @@ def _convert_properties_to_dict(rules, properties):
         matched_properties = {}
         # Handle legacy rules
         if isinstance(rules, list):
+            # If the rules are empty, return the matched properties
+            if not rules:
+                return matched_properties
             for i, and_rules in enumerate(rules):
                 for j, rule in enumerate(and_rules):
                     matched_properties.update(Dfr3Service._eval_property_from_inventory(rule, properties))
         elif isinstance(rules, dict):
+            # If the rules are empty, return the matched properties
+            if not rules:
+                return matched_properties
+
             # Handles new style of rules
             boolean = list(rules.keys())[0]  # AND or OR
             criteria = rules[boolean]