Log some errors in plugins

plugins/notfound/notfound.plugin.zsh

@@ -20,4 +20,6 @@ if (( $+commands[pkgfile] )); then
     echo "The command \"$1\" can be found in the following packages:"
     for p in $pkg; echo "    $p"
   }
+else
+  omz_log_msg "notfound: plugin requires pkgtools"
 fi

plugins/sprunge/sprunge.plugin.zsh

@@ -26,6 +26,7 @@ except:
   }
 else
   # if we happen to lack python, just report everything as text
+  omz_log_msg "sprunge: syntax highlighting disabled since python isn't available"
   sprunge_syntax() { echo 'text' }
 fi
 

plugins/tmux/tmux.plugin.zsh

@@ -14,4 +14,6 @@ if (( $+commands[tmux] )); then
       fi
     }
   fi
+else
+  omz_log_mgs "notfound: plugin requires tmux"
 fi