[Oberon] Bluebottle empty String check

[Bernhard Egger]

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> Witch solution is more convenient, as machine code generation?
> 
> str: Utilities.String;
> 
> IF str^ # "" THEN
> or
> IF str[0] # 0X THEN

if you use Builder.Compile to compile your code both versions are equal:
array bound check for 0 plus character comparison

if you use Paco:
IF (str^ # "") THEN
is compiled as a string comparison, i.e. both strings are compared until
they differ or the end of the strings is found.

IF (str[0] # 0X) THEN
is compiled as a simple character comparison (array bound check plus
character comparison)

- -> IF (str[0] # 0X) is compiled well on both compilers, whereas the
other version is slightly slower when compiled with Paco.

Bernhard
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