Add more robust conversion of nwbinspector values to string (#781)

Co-authored-by: Ben Dichter <[email protected]>

Author: ehennestad

inspectNwbFile.m

@@ -111,11 +111,11 @@
         catch
             resultTable(i).location = "N/A";
         end
-        resultTable(i).message = string(C{i}.message);
-        resultTable(i).object_name = string(C{i}.object_name);
-        resultTable(i).object_type = string(C{i}.object_type);
-        resultTable(i).file_path = string(C{i}.file_path);
-        resultTable(i).check_function_name = string(C{i}.check_function_name);
+        resultTable(i).message = pyValueToString(C{i}.message);
+        resultTable(i).object_name = pyValueToString(C{i}.object_name);
+        resultTable(i).object_type = pyValueToString(C{i}.object_type);
+        resultTable(i).file_path = pyValueToString(C{i}.file_path);
+        resultTable(i).check_function_name = pyValueToString(C{i}.check_function_name);
     end
     resultTable = struct2table(resultTable);
 end
@@ -210,3 +210,11 @@
 
     isNwbInspectorInstalled = status == 0;
 end
+
+function strValue = pyValueToString(pyValue)
+    if isa(pyValue, 'py.NoneType')
+        strValue = string(missing);
+    else
+        strValue = string(pyValue);
+    end
+end