Loading frontend dependencies with different loading strategies causes an exception

[paulroemer]

With recent Flow versions a check for multiple dependency loading strategies was introduced:

07:13:35 qtp1018959698-137 2018-03-09 09:13:35 WARN [c.v.f.c.i.DependencyList] - Dependency with url frontend://components/../bower_components/polymer/lib/elements/custom-style.html was imported with two different loading strategies: EAGER and LAZY. The loading strategy is changed to EAGER to avoid conflicts. This may impact performance.
07:13:35 qtp1018959698-137 2018-03-09 09:13:35 ERROR [c.v.f.s.DefaultErrorHandler] - 
07:13:35 java.lang.IllegalStateException: Dependency with url frontend://components/../bower_components/polymer/lib/elements/custom-style.html is loaded both with LAZY and EAGER modes
07:13:35 	at com.vaadin.flow.component.internal.DependencyList.checkDuplicateDependency(DependencyList.java:94)
07:13:35 	at com.vaadin.flow.component.internal.DependencyList.lambda$add$0(DependencyList.java:76)

This information is good, but please, just log a warning. It isn't that severe that an exception should be thrown that will stop loading the whole view.