Article XIV, Section 7 [Existing indebtedness not impaired.]
          Nothing in this article shall be so construed as to impair or add to the obligation of any debt heretofore contracted, in accordance with the laws of Utah Territory, by any county, city, town or school district, or to prevent the contracting of any debt, or the issuing of bonds therefor, in accordance with said laws, upon any proposition for that purpose, which, according to said laws, may have been submitted to a vote of the qualified electors of any county, city, town or school district before the day on which this Constitution takes effect.