Fix author, composer, and performer links so they work correctly

Hi!

Possibly this problem does not depend on this module, but rather from the Amazon API. Anyway, this is what happens

English_US locale: http://eng.i-iter.org/amazon_store?author=Philip%20K.%20Dick working
French locale: http://pms.i-iter.org/amazon_store?author=Philip%20Kindred%20Dick blank page (with error in the drupal log)

The drupal log says
Amazon error returned. Code=AWS.ECommerceService.NoExactMatches}, Message=We did not find any matches for your request. // ///SimpleXMLElement Object ( [OperationRequest] => SimpleXMLElement Object ( [HTTPHeaders] => SimpleXMLElement Object ( [Header] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => UserAgent [Value] => Drupal (+http://drupal.org/) ) ) ) [RequestId] => 1MQ0HKNPQV2FF1B8A2HV [Arguments] => SimpleXMLElement Object ( [Argument] => Array ( [0] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => SearchIndex [Value] => All ) ) [1] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => MerchantId [Value] => All ) ) [2] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => AssociateTag [Value] => pmsiiter-21 ) ) [3] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Service [Value] => AWSECommerceService ) ) [4] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Keywords [Value] => "Philip Kindred Dick" ) ) [5] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Signature [Value] => Ge9Tz++qeh1E40BPx3E8GxjYJzqNE05+X0WCKOSRvWo= ) ) [6] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => ResponseGroup [Value] => BrowseNodes,Variations,ItemAttributes,Images,EditorialReview,OfferFull,Reviews,Similarities,AlternateVersions,Large ) ) [7] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Operation [Value] => ItemSearch ) ) [8] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => AWSAccessKeyId [Value] => AKIAIHCEHFMC6X6NGQLQ ) ) [9] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Timestamp [Value] => 2009-11-01T17:34:15Z ) ) [10] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Version [Value] => 2009-03-31 ) ) ) ) [RequestProcessingTime] => 0.07358717918396 ) [Items] => SimpleXMLElement Object ( [Request] => SimpleXMLElement Object ( [IsValid] => True [ItemSearchRequest] => SimpleXMLElement Object ( [Keywords] => "Philip Kindred Dick" [MerchantId] => All [ResponseGroup] => Array ( [0] => Similarities [1] => OfferFull [2] => Large [3] => AlternateVersions [4] => ItemAttributes [5] => Reviews [6] => BrowseNodes [7] => Variations [8] => EditorialReview [9] => Images ) [SearchIndex] => All ) [Errors] => SimpleXMLElement Object ( [Error] => SimpleXMLElement Object ( [Code] => AWS.ECommerceService.NoExactMatches [Message] => We did not find any matches for your request. ) ) ) [TotalResults] => 0 [TotalPages] => 0 ) )