Show a proper error. A failure doesn't always mean the command isn't available, and we check for it on startup

lib/pleroma/upload/filter/exiftool.ex

@@ -21,8 +21,8 @@ defmodule Pleroma.Upload.Filter.Exiftool do
         {error, 1} -> {:error, error}
       end
     rescue
-      _e in ErlangError ->
-        {:error, "exiftool command not found"}
+      e in ErlangError ->
+        {:error, "#{__MODULE__}: #{inspect(e)}"}
     end
   end
 

lib/pleroma/upload/filter/mogrifun.ex

@@ -44,8 +44,8 @@ defmodule Pleroma.Upload.Filter.Mogrifun do
       Filter.Mogrify.do_filter(file, [Enum.random(@filters)])
       {:ok, :filtered}
     rescue
-      _e in ErlangError ->
-        {:error, "mogrify command not found"}
+      e in ErlangError ->
+        {:error, "#{__MODULE__}: #{inspect(e)}"}
     end
   end
 

lib/pleroma/upload/filter/mogrify.ex

@@ -14,8 +14,8 @@ defmodule Pleroma.Upload.Filter.Mogrify do
       do_filter(file, Pleroma.Config.get!([__MODULE__, :args]))
       {:ok, :filtered}
     rescue
-      _e in ErlangError ->
-        {:error, "mogrify command not found"}
+      e in ErlangError ->
+        {:error, "#{__MODULE__}: #{inspect(e)}"}
     end
   end