refactor: drop without error the AST preproc node

fortls/parsers/internal/parser.py

@@ -2076,9 +2076,9 @@ def replace_vars(line: str):
             defs = {}
         try:
             return eval(replace_ops(replace_vars(replace_defined(text))))
-        except Exception as exc:
-            log.error("Error evaluating preprocessor IF statement: %s", exc)
-            raise ParserError(exc) from exc
+        # This needs to catch all possible exceptions thrown by eval()
+        except Exception:
+            return False
 
     def expand_func_macro(def_name: str, def_value: tuple[str, str]):
         def_args, sub = def_value

test/test_parser.py

@@ -44,3 +44,7 @@ def test_load_from_disk_exception():
 
 def test_preprocess_missing_includes_exception():
     preprocess_file(["#include 'nonexistent_file.f90'"])
+
+
+def test_preprocess_eval_if_exception():
+    preprocess_file(["#if (1=and=1)", 'print*, "1==1"', "#endif"])