Wrong number of cells in a row crashes

[pe1uca]

Is your feature request related to a problem? Please describe.
Because of a mistake I made when migrating from another table library, I left an extra column cell (old library's corner)
This makes TableView to crash here with a NullPointerException

TableView/tableview/src/main/java/com/evrencoskun/tableview/layoutmanager/ColumnHeaderLayoutManager.java

Lines 96 to 99 in cf9c7f6

	public int getFirstItemLeft() {
	View firstColumnHeader = findViewByPosition(findFirstVisibleItemPosition());
	return firstColumnHeader.getLeft();
	}

Describe the solution you'd like
Make TableView library gracefully handle this case.
When commenting this line I was able to prevent the app from crashing

TableView/tableview/src/main/java/com/evrencoskun/tableview/layoutmanager/CellLayoutManager.java

Line 258 in cf9c7f6

mColumnHeaderLayoutManager.customRequestLayout();

The table will look wrong, but I think is better than the misleading NullPointerException.

Additional context
I followed the wiki for this example, only replacing object by string as data.