I have a dataset containing 10ish attributes. Most of the fields are empty (if an item has a value in attr1, it has no value in attr2, attr3, attrN, etc), and I want to have a single attribute containing the value of all the others.
Best answer by geomancer
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Here is an example of the original table.
+9
You can just use the AttributeCreator with an IF statement in the "Attribute value". 
In this IF statement you can test if for example nom_1 has a value, if true you use the value of nom_1, else you continue testing the other attributes. Note that this method only works if 1 of the 10 attributes is filled per feature as described in your question.
+36
Or you can simply concatenate the attribute values in your new attribute.
@Value(attr_0)@Value(attr_1)@Value(attr_2)@Value(attr_3)
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