Fix #4397 - Don't allow context menu when a line is empty
Fix #4397 - Don't allow context menu when a line is empty

ruturajv/debugger.html,jasonLaster/debugger.html,borian/debugger.html,jasonLaster/debugger.html,amitzur/debugger.html,borian/debugger.html,borian/debugger.html,amitzur/debugger.html,ruturajv/debugger.html,ruturajv/debugger.html,bomsy/debugger.html,darkwing/debugger.html,jasonLaster/debugger.html,devtools-html/debugger.html,amitzur/debugger.html,devtools-html/debugger.html,wldcordeiro/debugger.html,jbhoosreddy/debugger.html,darkwing/debugger.html,borian/debugger.html,devtools-html/debugger.html,ruturajv/debugger.html,jasonLaster/debugger.html,bomsy/debugger.html,bomsy/debugger.html,wldcordeiro/debugger.html,wldcordeiro/debugger.html,borian/debugger.html,ruturajv/debugger.html,darkwing/debugger.html,darkwing/debugger.html,devtools-html/debugger.html,jbhoosreddy/debugger.html,amitzur/debugger.html,ruturajv/debugger.html,darkwing/debugger.html,devtools-html/debugger.html,wldcordeiro/debugger.html,darkwing/debugger.html,amitzur/debugger.html,jbhoosreddy/debugger.html,jbhoosreddy/debugger.html,ruturajv/debugger.html,bomsy/debugger.html,jasonLaster/debugger.html,devtools-html/debugger.html,devtools-html/debugger.html,bomsy/debugger.html,borian/debugger.html,bomsy/debugger.html,bomsy/debugger.html,wldcordeiro/debugger.html,amitzur/debugger.html,wldcordeiro/debugger.html,jasonLaster/debugger.html,jbhoosreddy/debugger.html,jbhoosreddy/debugger.html,jbhoosreddy/debugger.html,wldcordeiro/debugger.html,jasonLaster/debugger.html,darkwing/debugger.html