Question: question on evalc and solve

Should this generate an error?

restart;
r:=evalc(Im(1/ln(x)));
solve(r,{x});

This did not help. Same error as above.

restart;
r:=evalc(Im(1/ln(x))):
solve(r,{x}) assuming x::real;

This made Maple not give an error

restart;
r:=evalc(Im(1/ln(x))):
solve(r,{x}) assuming x::real, x>0;

       {x = x}

Also this worked, but NULL returned

restart;
r:=evalc(Im(1/ln(x))):
solve(r,{x}) assuming x::real, x<0;

Also this worked with NULL returned

restart;
r:=evalc(Im(1/ln(x))):
solve(r,{x}) assuming   x<0;

Is this how Maple generally works? i.e It generates an exception error when it is not able to solve something? Or does it normally echo back the input back if it can't solve something? Or at least return NULL if it can't solve it? I am havin hard time figuring which method to use to check if Maple is able to solve something or not, because each time it seems to do something different.

Should one then put a try/catch around each Maple call, and treat the try section as if Maple was not able to solve the equation whatever it was?