Charts are not rendered

[ripla]

Steps to reproduce

1. Open Bakery
2. Create a new template
3. Add a chart to the template:

<link rel="import" href="bower_components/vaadin-charts/src/vaadin-chart.html">
<link rel="import" href="bower_components/vaadin-charts/src/vaadin-chart-series.html">

<vaadin-chart title="Solar Employment Growth by Sector, 2010-2016" subtitle="Source: thesolarfoundation.com" categories="[2010, 2011, 2012, 2013, 2014, 2015, 206, 2017]">
 <vaadin-chart-series title="Installation" unit="Number of Employees" values="[43934, 52503, 57177, 69658, 97031, 119931, 137133, 154175]"></vaadin-chart-series>
 <vaadin-chart-series title="Manufacturing" unit="Number of Employees" values="[24916, 24064, 29742, 29851, 32490, 30282, 38121, 40434]"></vaadin-chart-series>
 <vaadin-chart-series title="Sales &amp; Distribution" unit="Number of Employees" values="[11744, 17722, 16005, 19771, 20185, 24377, 32147, 39387]"></vaadin-chart-series>
 <vaadin-chart-series title="Project Development" unit="Number of Employees" values="[null, null, 7988, 12169, 15112, 22452, 34400, 34227]"></vaadin-chart-series>
 <vaadin-chart-series title="Other" unit="Number of Employees" values="[12908, 5948, 8105, 11248, 8989, 11816, 18274, 18111]"></vaadin-chart-series>
</vaadin-chart>

Actual behavior

Nothing is shown. In addition, these errors are shown in the console of the external preview:

GET http://localhost:51306/project/src/main/resources/static/frontend/bower_components/vaadin-charts/theme/lumo/vaadin-chart.html 404 (Not Found)
GET http://localhost:51306/project/src/main/resources/static/frontend/bower_components/vaadin-charts/theme/lumo/vaadin-chart-series.html 404 (Not Found)

Expected behavior

The chart from this demo is rendered: https://charts.demo.vaadin.com/vaadin-charts/#/line.

IDE, Designer and OS version

IntelliJ 2018, Designer 3.1.2, macOS

[ripla]

Discuss with other teams, and figure out a better heuristic for detection.

[ripla]

After talking to @alvarezguille, it seems that we should only import the root vaadin-charts.html and nothing else. So one way to look at it is to detect first if a component has the theme folder, and only then import the src file instead of the root one.