suppress error when rustup/cargo not available

dot_config/environment

@@ -1,6 +1,6 @@
 # icky, but necessary since this might inject the needed XDG vars
 . "$HOME/.config/environment.local" 2>/dev/null
-. "$XDG_DATA_HOME/cargo/env"
+. "$XDG_DATA_HOME/cargo/env" 2>/dev/null
 
 # editor
 export EDITOR=/usr/bin/nvim