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`<template if=` is not a guard

In admin edit mode, when removing all competences from a subcategory:

Exception: Uncaught Error: RangeError: index (0) must be in the range [0..0)
Stack Trace:
#0      List.[] (dart:core-patch/growable_array.dart:136)
#1      ObservableList.[] (package:observe/src/observable_list.dart:90:49)
#2      IndexObserver._updateSelf (package:polymer_expressions/eval.dart:754:27)
#3      ExpressionObserver._observe (package:polymer_expressions/eval.dart:315:16)
#4      ExpressionObserver._invalidate (package:polymer_expressions/eval.dart:296:13)
#5      IndexObserver._updateSelf.<anonymous closure> (package:polymer_expressions/eval.dart:759:65)
#6      _RootZone.runUnaryGuarded (dart:async/zone.dart:1093)
#7      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341)
#8      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:270)
#9      _SyncBroadcastStreamController._sendData.<anonymous closure> (dart:async/broadcast_stream_controller.dart:370)
#10     _BroadcastStreamController._forEachListener (dart:async/broadcast_stream_controller.dart:312)
#11     _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:369)
#12     _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:237)
#13     deliverListChanges (package:observe/src/observable_list.dart:265:23)
#14     _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#15     _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#16     _handleMutation (dart:html:42316)

Harmless exception.
This is because the polymer expression inside a template if is still executed and there is an OOB error because length = 0:

        <template if="{{ project.categories.length > category_nr }}">
          <section-edit-category category="{{project.categories[category_nr]}}" page="{{page}}" index="{{subcategory_nr}}"></section-edit-category>

More: Polymer/polymer#265

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