fix: handle reports with line 0 executed (#73)

Recently when testing the docs for integrating ATS I did [this commit](https://app.codecov.io/gh/giovanni-guidini/ats-data/commit/c24c1db8aa27fcda2d311fdcd293c20697030389)
for which processing failed. Checking the logs it failed because of

```
  [... removed stack trace...]
  File "/worker/services/report/languages/pycoverage.py", line 56, in process
    report_file.append(
  File "/usr/local/lib/python3.10/site-packages/shared/reports/resources.py", line 341, in append
    raise ValueError("Line number must be greater then 0. Got %s" % ln)
ValueError: Line number must be greater then 0. Got 0
```

Indeed when I donwloaded and checked the uploaded files there were 3 of them with `executed_lines: [0]`.
They were all `__init__.py` files. Idk why that happened, to be honest. It looks strange because the 3 files are empty.

In any case it's an easy fix that will not hurt us.
I think line 0 should not exist. It might indicate that when importing the code or something like that the file was
executed somehow, but for `__init__.py` files with some content in them the list of lines executed is as expected.

services/report/languages/pycoverage.py

@@ -53,14 +53,15 @@ def process(
                             str(ln), []
                         )
                     ]
-                    report_file.append(
-                        ln,
-                        report_builder_session.create_coverage_line(
-                            fixed_filename,
-                            cov,
-                            coverage_type=CoverageType.line,
-                            labels_list_of_lists=label_list_of_lists,
-                        ),
-                    )
+                    if ln > 0:
+                        report_file.append(
+                            ln,
+                            report_builder_session.create_coverage_line(
+                                fixed_filename,
+                                cov,
+                                coverage_type=CoverageType.line,
+                                labels_list_of_lists=label_list_of_lists,
+                            ),
+                        )
                 report_builder_session.append(report_file)
         return report_builder_session.output_report()

services/report/languages/tests/unit/test_pycoverage.py

@@ -157,6 +157,20 @@
             "excluded_lines": [],
             "contexts": {},
         },
+        "services/__init__.py": {
+            "executed_lines": [0],
+            "summary": {
+                "covered_lines": 0,
+                "num_statements": 0,
+                "percent_covered": "100.0",
+                "percent_covered_display": "100",
+                "missing_lines": 0,
+                "excluded_lines": 0,
+            },
+            "missing_lines": [],
+            "excluded_lines": [],
+            "contexts": {"0": [0]},
+        },
     },
     "labels_table": {
         "0": "",