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Blank plot returned from simple expression


I'm using Mathematica 8.0.0, and I'm having trouble understanding why
Plot[Im[(-1)^x], {x, 0, 2}]
returns a blank plot while
ListPlot[Table[Im[(-1)^x], {x, 0, 2, 0.1}]]
returns the expected plot.

Anyone who can enlighten me about what's going on?



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