Don't double-eval quoted params (fixes #13)

[GiovanH]

Because the code redefines param, without the elif here this block can run on an empty param string, incorrectly running eval twice:

            elif param[0] == param[-1] == "'":
                param = eval(param)

This patch fixes the bug.

[vokimon]

Could you, please, propose a unit test to illustrate the test case?

[GiovanH]

I didn't realize you were running test cases. It looks like many of the test cases here are already failing:

---------- coverage: platform win32, python 3.11.9-final-0 -----------
Name                                Stmts   Miss Branch BrPart  Cover
---------------------------------------------------------------------
customblocks\__init__.py                1      0      0      0   100%
customblocks\customblocks.py          141      0     58      0   100%
customblocks\entrypoints.py            21      8     10      2    55%
customblocks\generators.py            144     19     36      1    88%
customblocks\testutils.py              26      0      0      0   100%
customblocks\utils\__init__.py          3      0      0      0   100%
customblocks\utils\fetcher.py          50      0     20      0   100%
customblocks\utils\hyperscript.py      45      0     26      0   100%
customblocks\utils\image.py            44      4      8      2    88%
customblocks\utils\pageinfo.py         70      3     16      0    92%
---------------------------------------------------------------------
TOTAL                                 545     34    174      5    93%

Let me see about adding a new case to cover this fix.

[GiovanH]

I have pushed exactly the error case I described in #13 as a test case. It fails in 1.5.3 but passes with this fix.

[vokimon]

Now, all tests are passing in master. Could you rebase your branch?

[GiovanH]

You should have full permission to push changes to this branch, but I will run a rebase.

[vokimon]

The error is another fragile test of mine depending on external services. Let's merge.