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Don't call #upcase on nil.
git-svn-id: http://svn.redmine.org/redmine/trunk@13994 e93f8b46-1217-0410-a6f0-8f06a7374b81
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@ -509,7 +509,7 @@ class Query < ActiveRecord::Base
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# Returns the SQL sort order that should be prepended for grouping
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def group_by_sort_order
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if grouped? && (column = group_by_column)
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order = (sort_criteria_order_for(column.name) || column.default_order).upcase
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order = (sort_criteria_order_for(column.name) || column.default_order).try(:upcase)
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column.sortable.is_a?(Array) ?
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column.sortable.collect {|s| "#{s} #{order}"}.join(',') :
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"#{column.sortable} #{order}"
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