Bugfix which caused a crash in Table class. Fixes #67

application.go

@@ -270,9 +270,11 @@ func (a *Application) SetFocus(p Primitive) *Application {
 		a.screen.HideCursor()
 	}
 	a.Unlock()
-	p.Focus(func(p Primitive) {
-		a.SetFocus(p)
-	})
+	if p != nil {
+		p.Focus(func(p Primitive) {
+			a.SetFocus(p)
+		})
+	}
 
 	return a
 }

table.go

@@ -582,6 +582,7 @@ ColumnLoop:
 			tableWidth -= widths[t.fixedColumns] + 1
 			columns = append(columns[:t.fixedColumns], columns[t.fixedColumns+1:]...)
 			widths = append(widths[:t.fixedColumns], widths[t.fixedColumns+1:]...)
+			expansions = append(expansions[:t.fixedColumns], expansions[t.fixedColumns+1:]...)
 		}
 
 		// What's this column's width (without expansion)?