Improve error message in types.util.dynamictable.checkConfig on invalid shape (#803)

* Update checkConfig.m

* Update checkConfig.m

* Refactor checkConfig: build error message only on error path

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Co-authored-by: ehennestad <17237719+ehennestad@users.noreply.github.com>

* Revert "Refactor checkConfig: build error message only on error path"

This reverts commit eedc96f.

* Update checkConfig.m

Add extra guard for empty columns in check

* Update run_tests.yml

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: ehennestad <17237719+ehennestad@users.noreply.github.com>

Author: ehennestad

+types/+util/+dynamictable/checkConfig.m

@@ -31,7 +31,12 @@ function checkConfig(DynamicTable, ignoreList)
     % do not check specified columns - useful for classes that build on DynamicTable class
     columns = setdiff(DynamicTable.colnames, ignoreList);
 
+    if isempty(columns)
+        return
+    end
+
     columnHeights = zeros(length(columns), 1);
+    columnNames = strings(length(columns), 1);
     for iCol = 1:length(columns)
         columnName = retrieveHighestIndex(DynamicTable, columns{iCol});
         columnHeight = unique(types.util.dynamictable.getColumnHeight(getVector(DynamicTable, columnName)));
@@ -40,16 +45,20 @@ function checkConfig(DynamicTable, ignoreList)
             'NWB:DynamicTable:CheckConfig:InvalidShape', ...
             'Invalid compound column detected: compound column heights must all be the same.');
         columnHeights(iCol) = columnHeight;
+        columnNames(iCol) = columnName;
     end
 
     tableHeight = unique(columnHeights);
     if isempty(tableHeight)
         tableHeight = 0;
     end
+
+    formatSpec = sprintf('  %%-%ds %%d', max(strlength(columnNames)));
     assert(isscalar(tableHeight), ...
         'NWB:DynamicTable:CheckConfig:InvalidShape', ...
-        ['Invalid table detected: ' ...
-        'column heights (vector lengths or number of matrix columns) must be the same.']);
+        ['Invalid table: all columns must have the same height (number of rows).\n\n' ...
+        'Detected column heights:\n' ...
+        strjoin( compose(formatSpec, columnNames, columnHeights), newline) ]);
 
     if isempty(DynamicTable.id)
         types.util.dynamictable.internal.initDynamicTableId(DynamicTable, tableHeight);