Don't look for KSChan channel __doc__ string with ModelView.

share/lib/python/neuron/__init__.py

@@ -742,10 +742,11 @@ def nrn_dll(printpath=False):
 
 def _modelview_mechanism_docstrings(dmech, tree):
     if dmech.name not in ("Ra", "capacitance"):
-        docs = getattr(h, dmech.name).__doc__
-        if docs.strip():
-            for line in docs.split("\n"):
-                tree.append(line, dmech.location, 0)
+        if hasattr(nrn, dmech.name):  # KSChan not listed (and has no __doc__)
+            docs = getattr(h, dmech.name).__doc__
+            if docs.strip():
+                for line in docs.split("\n"):
+                    tree.append(line, dmech.location, 0)
 
 
 _sec_db = {}

test/hoctests/tests/test_mview.py

@@ -0,0 +1,8 @@
+# see PR #3075
+# Don't look for KSChan channel __doc__ string with ModelView.
+
+from neuron import h, gui
+
+h.load_file(h.neuronhome() + "/demo/dynclamp.hoc")
+h.load_file("mview.hoc")
+h.mview()