Merge pull request #70 from stefangachter/fix_label_color

Fix handling of color for labels

Author: petercorke

spatialmath/base/transforms3d.py

@@ -3281,10 +3281,8 @@ def trplot(
         if textcolor == "":
             textcolor = color[0]
 
-        if origincolor != "":
+        if origincolor == "":
             origincolor = color[0]
-        else:
-            origincolor = "black"
 
         # label the frame
         if frame != "":