[Rpm-maint] [rpm-software-management/rpm] Fix python ts.addErase() not raising exception on not-found packages (#1251)

[lgtm-com[bot]]

This pull request **fixes 1 alert** when merging d3b5712847684c94474c8573f143d619451fcea3 into 869a36c17224ada40614639f1c12345bfc748663 - [view on LGTM.com](https://lgtm.com/projects/g/rpm-software-management/rpm/rev/pr-49a6843de6d74ec491c6babb53b48b1784a3504f)

**fixed alerts:**

* 1 for Unnecessary delete statement in function

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