fix(template-compiler): handle potentially empty dataItems
fix(template-compiler): handle potentially empty dataItems

fixes https://github.com/aurelia-ui-toolkits/aurelia-kendoui-plugin/issues/117

smccrea/aurelia-kendoui-plugin,smccrea/aurelia-kendoui-plugin,aurelia-ui-toolkits/aurelia-kendoui-plugin,aurelia-ui-toolkits/aurelia-kendoui-bridge,aurelia-ui-toolkits/aurelia-kendoui-plugin,aurelia-ui-toolkits/aurelia-kendoui-bridge