Push whitelist now doesn't apply to branch deletion (#4601) (#4607)

models/branches.go

 		BranchName: branchName,
 	}
 
+	has, err := x.Exist(protectedBranch)
+	if err != nil {
+		return true, err
+	}
+	return has, nil
+}
+
+// IsProtectedBranchForPush checks if branch is protected for push
+func (repo *Repository) IsProtectedBranchForPush(branchName string, doer *User) (bool, error) {
+	if doer == nil {
+		return true, nil
+	}
+
+	protectedBranch := &ProtectedBranch{
+		RepoID:     repo.ID,
+		BranchName: branchName,
+	}
+
 	has, err := x.Get(protectedBranch)
 	if err != nil {
 		return true, err

modules/context/repo.go

 }
 
 // CanCommitToBranch returns true if repository is editable and user has proper access level
-//   and branch is not protected
+//   and branch is not protected for push
 func (r *Repository) CanCommitToBranch(doer *models.User) (bool, error) {
-	protectedBranch, err := r.Repository.IsProtectedBranch(r.BranchName, doer)
+	protectedBranch, err := r.Repository.IsProtectedBranchForPush(r.BranchName, doer)
 	if err != nil {
 		return false, err
 	}