Entries in summary.search are returning wrongly

[cpashartis]

Hello,

I've noticed recently that when using summary.search, that some entries in the return data structure are not correct when compared to the website.

`mp_result = mpr.materials.summary.search(chemsys='Mg', energy_above_hull=(0., .5), num_sites=(0, 20))

for entry in mp_result: print(entry.material_id, entry.is_stable) `

This searches for all Mg, but for some reason the entries such as mp-153 return as not stable.

[munrojm]

@cpashartis will take a closer look at this.