slightly more consistent empty-test & fix wording

README.md

@@ -23,7 +23,7 @@ Supported options are:
 - `separator`
 - `colourblocks`
 
-For less simple configuration I recommend editing the script, I tried to keep it simple.
+For less trivial configuration I recommend editing the script, I tried to keep it simple.
 
 ### Known Issues
 MacOS, BSD, and Android don't show much info.

fet.sh

@@ -54,7 +54,7 @@ if [ -e /proc/$$/comm ]; then
 	done
 
 	## WM/DE
-	[ ! "$wm" ] &&
+	[ "$wm" ] ||
 		# loop over all processes and check the binary name
 		for i in /proc/*/comm; do
 			read -r c < "$i"