Fix integer out of range#284

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PhilippMeissner wants to merge 4 commits intojbox-web:masterfrom

PhilippMeissner:fix-integer-out-of-range

Commits on Apr 22, 2018

added specs
philippmeissner
committed
added helper methods
philippmeissner
committed
catched invalid integer values; added empty-search fallback
philippmeissner
committed

Commits on Apr 26, 2018

fixed paranthesis, quotes; made logic more readable
philippmeissner
committed