Fix rake guides:validate task as it should be run from the guides directory; add exception handling
Fix rake guides:validate task as it should be run from the guides directory; add exception handling

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,bradleypriest/rails,georgeclaghorn/rails,felipecvo/rails,sealocal/rails,Envek/rails,mtsmfm/rails,illacceptanything/illacceptanything,gavingmiller/rails,esparta/rails,tijwelch/rails,lucasmazza/rails,MichaelSp/rails,esparta/rails,arunagw/rails,pschambacher/rails,sergey-alekseev/rails,ledestin/rails,MSP-Greg/rails,bolek/rails,tijwelch/rails,arunagw/rails,tjschuck/rails,yasslab/railsguides.jp,marklocklear/rails,gauravtiwari/rails,Stellenticket/rails,amoody2108/TechForJustice,brchristian/rails,palkan/rails,kmayer/rails,alecspopa/rails,Erol/rails,mtsmfm/railstest,jeremy/rails,illacceptanything/illacceptanything,untidy-hair/rails,yalab/rails,Vasfed/rails,lcreid/rails,BlakeWilliams/rails,tgxworld/rails,gavingmiller/rails,pschambacher/rails,Envek/rails,rbhitchcock/rails,aditya-kapoor/rails,assain/rails,kirs/rails-1,samphilipd/rails,matrinox/rails,iainbeeston/rails,Spin42/rails,illacceptanything/illacceptanything,EmmaB/rails-1,pschambacher/rails,baerjam/rails,kenta-s/rails,sergey-alekseev/rails,gauravtiwari/rails,bradleypriest/rails,joonyou/rails,shioyama/rails,georgeclaghorn/rails,kmayer/rails,Erol/rails,Edouard-chin/rails,yhirano55/rails,kenta-s/rails,elfassy/rails,Spin42/rails,georgeclaghorn/rails,aditya-kapoor/rails