Verification of convert inside the function

Depending on when the path is declared this solution would work in any case

plugins/catimg/catimg.plugin.zsh

@@ -7,10 +7,11 @@
 # Github: https://github.com/posva/catimg                                      #
 ################################################################################
 
-if [[ -x  `which convert` ]]; then
-  function catimg() {
+
+function catimg() {
+  if [[ -x  `which convert` ]]; then
     zsh $ZSH/plugins/catimg/catimg.sh $@
-  }
-else
+  else
     echo "catimg need convert (ImageMagick) to work)"
-fi
+  fi
+}