Don't fail if libraryjars can't be found

Summary:
Suffer silently if librarjars can't be found.
redexstats[fb4a_unstable,fb4a_stable]

Reviewed By: newobj

Differential Revision: D4529787

fbshipit-source-id: 769b0c587a7bdca289135253ada1cb49aa27dedd

tools/redex-all/main.cpp

@@ -454,7 +454,6 @@ int main(int argc, char* argv[]) {
               fprintf(stderr,
                       "ERROR: Library jar could not be loaded: %s\n",
                       library_jar.c_str());
-              exit(1);
             }
           }
         }