Fall back to one-arg require if searching fails.
Fall back to one-arg require if searching fails.

This is necessary during compilation, when both `load-file-name` and `buffer-file-name` are nil. Fixes issue #41.

calve/emacs-color-theme-solarized,dgoel/emacs-color-theme-solarized,junag/emacs-color-theme-solarized,sellout/emacs-color-theme-solarized,runningskull/emacs-color-theme-solarized,lokiiart/emacs-color-theme-solarized,jyp/emacs-color-theme-solarized,mattduck/emacs-color-theme-solarized,devnich/emacs-color-theme-roc,bradwright/emacs-color-theme-solarized,jaalto/emacs-epackage--color-theme-solarized,bradleywright/emacs-color-theme-solarized,longouyang/emacs-color-theme-solarized,dcherian/emacs-color-theme-solarized,gugek/emacs-color-theme-solarized,ramLlama/emacs-color-theme-solarized