Use safer key lookup and provide default value

Author: Garulf

flox/__init__.py

@@ -16,6 +16,7 @@
 from .launcher import Launcher
 from .browser import Browser
 from .settings import Settings
+from .string_matcher import DEFAULT_QUERY_SEARCH_PRECISION
 
 PLUGIN_MANIFEST = 'plugin.json'
 FLOW_LAUNCHER_DIR_NAME = "FlowLauncher"
@@ -241,7 +242,7 @@ def app_settings(self):
 
     @property
     def query_search_precision(self):
-        return self.app_settings['QuerySearchPrecision']
+        return self.app_settings.get('QuerySearchPrecision', DEFAULT_QUERY_SEARCH_PRECISION)
 
     @cached_property
     def user_keywords(self):