Do not fail if Makefile is missing or empty w/ support for fish 2.1.2

functions/__fisher_path_make.fish

@@ -1,14 +1,16 @@
 function __fisher_path_make -a path
-    if test -s $path/Makefile -o -s $path/makefile
-        pushd $path
+    if test ! -s $path/Makefile -o ! -s $path/makefile
+        return
+    end
 
-        set -e argv[1]
+    pushd $path
 
-        if not make $argv
-            popd
-            return 1
-        end
+    set -e argv[1]
 
+    if not make $argv
         popd
+        return 1
     end
+
+    popd
 end