Makes fkill run only if a process has been selected

Examples.md

@@ -81,7 +81,12 @@ Processes
 ```sh
 # fkill - kill process
 fkill() {
-  ps -ef | sed 1d | fzf -m | awk '{print $2}' | xargs kill -${1:-9}
+  pid=$(ps -ef | sed 1d | fzf -m | awk '{print $2}')
+
+  if [ "x$pid" != "x" ]
+  then
+    kill -${1:-9} $pid
+  fi
 }
 ```