Give more helpful error when toco_from_protos binary is not found.
Give more helpful error when toco_from_protos binary is not found.

PiperOrigin-RevId: 281362420
Change-Id: I46d58f8859909da5121175e5595c4b61b79c9bd3

tensorflow/tensorflow,gunan/tensorflow,annarev/tensorflow,jhseu/tensorflow,gautam1858/tensorflow,annarev/tensorflow,karllessard/tensorflow,yongtang/tensorflow,jhseu/tensorflow,karllessard/tensorflow,Intel-tensorflow/tensorflow,yongtang/tensorflow,karllessard/tensorflow,frreiss/tensorflow-fred,karllessard/tensorflow,aam-at/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,freedomtan/tensorflow,davidzchen/tensorflow,annarev/tensorflow,aam-at/tensorflow,tensorflow/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,petewarden/tensorflow,aam-at/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,adit-chandra/tensorflow,gunan/tensorflow,ppwwyyxx/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_saved_model,xzturn/tensorflow,adit-chandra/tensorflow,renyi533/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,renyi533/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,sarvex/tensorflow,sarvex/tensorflow,paolodedios/tensorflow,davidzchen/tensorflow,aam-at/tensorflow,petewarden/tensorflow,adit-chandra/tensorflow,Intel-tensorflow/tensorflow,renyi533/tensorflow,jhseu/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,petewarden/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,karllessard/tensorflow,renyi533/tensorflow,gautam1858/tensorflow,karllessard/tensorflow,xzturn/tensorflow,ppwwyyxx/tensorflow,arborh/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,xzturn/tensorflow,jhseu/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,sarvex/tensorflow,paolodedios/tensorflow,renyi533/tensorflow,xzturn/tensorflow,xzturn/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,gunan/tensorflow,frreiss/tensorflow-fred,Intel-Corporation/tensorflow,arborh/tensorflow,jhseu/tensorflow,renyi533/tensorflow,freedomtan/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,petewarden/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,karllessard/tensorflow,annarev/tensorflow,arborh/tensorflow,frreiss/tensorflow-fred,Intel-tensorflow/tensorflow,tensorflow/tensorflow,renyi533/tensorflow,adit-chandra/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,adit-chandra/tensorflow,paolodedios/tensorflow,frreiss/tensorflow-fred,aam-at/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gunan/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,aldian/tensorflow,davidzchen/tensorflow,gunan/tensorflow,gunan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,xzturn/tensorflow,renyi533/tensorflow,gautam1858/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,yongtang/tensorflow,arborh/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,renyi533/tensorflow,paolodedios/tensorflow,arborh/tensorflow,freedomtan/tensorflow,aldian/tensorflow,tensorflow/tensorflow,ppwwyyxx/tensorflow,cxxgtxy/tensorflow,jhseu/tensorflow,petewarden/tensorflow,paolodedios/tensorflow,arborh/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-Corporation/tensorflow,sarvex/tensorflow,freedomtan/tensorflow,aldian/tensorflow,annarev/tensorflow,aldian/tensorflow,tensorflow/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow,Intel-Corporation/tensorflow,xzturn/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,karllessard/tensorflow,petewarden/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,ppwwyyxx/tensorflow,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,freedomtan/tensorflow,arborh/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,annarev/tensorflow,arborh/tensorflow,gunan/tensorflow,renyi533/tensorflow,arborh/tensorflow,yongtang/tensorflow,cxxgtxy/tensorflow,xzturn/tensorflow,adit-chandra/tensorflow,gunan/tensorflow,adit-chandra/tensorflow,aam-at/tensorflow,petewarden/tensorflow,aam-at/tensorflow,Intel-Corporation/tensorflow,petewarden/tensorflow,petewarden/tensorflow,sarvex/tensorflow,jhseu/tensorflow,adit-chandra/tensorflow,davidzchen/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-pywrap_saved_model,petewarden/tensorflow,cxxgtxy/tensorflow,aldian/tensorflow,annarev/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,jhseu/tensorflow,karllessard/tensorflow,arborh/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,adit-chandra/tensorfl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