Update debug messages on perception

Author: spencer@primus

avstack/modules/perception/base.py

@@ -198,7 +198,7 @@ def load_model_from_checkpoint(self, config_file, checkpoint_file, gpu):
                 chk_path = os.path.join(mm2d_root, checkpoint_file)
         if not os.path.exists(chk_path):
             raise FileNotFoundError(
-                f"Cannot find {checkpoint_file} checkpoint, mm3d root: {mm3d_root}, mm2d root: {mm2d_root}"
+                f"Cannot find {checkpoint_file} checkpoint\n(tried {chk_path})\nmm3d root: {mm3d_root}\nmm2d root: {mm2d_root}"
             )
 
         # set up inference model settings

avstack/modules/perception/monoculardepth.py

@@ -11,7 +11,7 @@
 try:
     from midas.model_loader import load_model
 except ModuleNotFoundError:
-    print("MIDAS module not found.")
+    print("MIDAS module not found (this is not an error).")
 
 from avstack import __file__ as avfile
 from avstack.config import MODELS