From 5a7d9a9f15b6275cf84c2bf143517439d96133b6 Mon Sep 17 00:00:00 2001
From: David Manthey <david.manthey@kitware.com>
Date: Wed, 15 Nov 2023 22:42:16 -0500
Subject: [PATCH] Guard against an empty list.

---
 histomicstk/features/compute_intensity_features.py   | 6 +++++-
 histomicstk/features/compute_morphometry_features.py | 8 ++++++--
 histomicstk/features/graycomatrixext.py              | 2 +-
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/histomicstk/features/compute_intensity_features.py b/histomicstk/features/compute_intensity_features.py
index 93d9cba12..d7cd4c20e 100644
--- a/histomicstk/features/compute_intensity_features.py
+++ b/histomicstk/features/compute_intensity_features.py
@@ -1,4 +1,6 @@
 """Compute intensity features in labeled image."""
+import warnings
+
 import numpy as np
 
 
@@ -123,7 +125,9 @@ def compute_intensity_features(
     # conditionally execute calculations if x in the features list
     def _conditional_execution(feature, func, *args, **kwargs):
         if feature in feature_list:
-            fdata.at[i, feature] = func(*args, **kwargs)
+            with warnings.catch_warnings():
+                warnings.simplefilter('ignore', RuntimeWarning)
+                fdata.at[i, feature] = func(*args, **kwargs)
 
     def _return_input(x):
         return x
diff --git a/histomicstk/features/compute_morphometry_features.py b/histomicstk/features/compute_morphometry_features.py
index b286c8418..4ca8ec895 100644
--- a/histomicstk/features/compute_morphometry_features.py
+++ b/histomicstk/features/compute_morphometry_features.py
@@ -206,8 +206,12 @@ def boxcount(arr, k):
         counts.append(boxcount(Z, size))
 
     # Fit the successive log(sizes) with log (counts)
+    coeffs = [0]
     with warnings.catch_warnings():
         warnings.simplefilter('ignore', np.RankWarning)
-        coeffs = np.polyfit(np.log(sizes), np.log(counts), 1)
-
+        if len(counts):
+            try:
+                coeffs = np.polyfit(np.log(sizes), np.log(counts), 1)
+            except TypeError:
+                pass
     return -coeffs[0]
diff --git a/histomicstk/features/graycomatrixext.py b/histomicstk/features/graycomatrixext.py
index 9e4a81a36..81dc4f5d4 100644
--- a/histomicstk/features/graycomatrixext.py
+++ b/histomicstk/features/graycomatrixext.py
@@ -209,7 +209,7 @@ def graycomatrixext(im_input, im_roi_mask=None,
             cur_glcm += cur_glcm.T
 
         # normalize if asked
-        if normed:
+        if normed and cur_glcm.sum():
             cur_glcm /= cur_glcm.sum()
 
         glcm[:, :, i] = cur_glcm