Pass user only if it's non-empty. Patch by Sandeep.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78184 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/bugpoint/ToolRunner.cpp b/tools/bugpoint/ToolRunner.cpp
index 81314a8..9180c53 100644
--- a/tools/bugpoint/ToolRunner.cpp
+++ b/tools/bugpoint/ToolRunner.cpp
@@ -698,8 +698,10 @@
   else {
     ProgramArgs.push_back(RemoteClientPath.c_str());
     ProgramArgs.push_back(RemoteHost.c_str());
-    ProgramArgs.push_back("-l");
-    ProgramArgs.push_back(RemoteUser.c_str());
+    if (!RemoteUser.empty()) {
+      ProgramArgs.push_back("-l");
+      ProgramArgs.push_back(RemoteUser.c_str());
+    }
     if (!RemotePort.empty()) {
       ProgramArgs.push_back("-p");
       ProgramArgs.push_back(RemotePort.c_str());