Fish: only load colors if they are defined

.config/fish/config.fish

@@ -1,6 +1,6 @@
 set -x EDITOR nvim
 set -x PAGER less
-set -x MANPAGER "sh -c 'col -bx | bat -l man -p'"
+#set -x MANPAGER 'sh -c \'col -bx | bat -l man -p\''
 set -x fish_prompt_pwd_dir_length 1
 set -x fish_greeting ''
 set fish_complete_path $fish_complete_path /usr/share/fish/completions
@@ -21,7 +21,9 @@ set -x PATH $PATH /home/kmcr/.codon
 #if status is-interactive
 #  cat ~/.cache/wal/sequences
 #end
-source ~/.local/share/nvim/lazy/falcon/exa/EXA_COLORS
+if test -e ~/.local/share/nvim/lazy/falcon/exa/EXA_COLORS
+    source ~/.local/share/nvim/lazy/falcon/exa/EXA_COLORS
+end
 
 function list_dir --on-variable PWD
     ls