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use-default-preference-values
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Require providing a second parameter to ``get*Pref`` methods instead of
using a try/catch block.
Examples of incorrect code for this rule:
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.. code-block:: js
try { blah = branch.getCharPref('blah'); } catch(e) {}
Examples of correct code for this rule:
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.. code-block:: js
blah = branch.getCharPref('blah', true);