http://llvm.org/bugs/show_bug.cgi?id=11560 lldb::SBTarget::FindFirstType crashes when passed None

Add null checks to several functions.  Plus add test scenario for passing None to SBTarget.FindFirstType(None) and friends.

llvm-svn: 146540

lldb/source/Core/Module.cpp

@@ -506,6 +506,9 @@ Module::FindTypes_Impl (const SymbolContext& sc, const ConstString &name, const
 static const char*
 StripTypeName(const char* name_cstr)
 {
+    // Protect against null c string.
+    if (!name_cstr)
+        return name_cstr;
     const char* skip_namespace = strstr(name_cstr, "::");
     const char* template_arg_char = strchr(name_cstr, '<');
     while (skip_namespace != NULL)