Prevent exceptions of unintended type from escaping from parser (#407)

Author: liss-h

private/rdf4cpp/parser/IStreamQuadIteratorSerdImpl.cpp

@@ -51,6 +51,13 @@ nonstd::expected<Node, SerdStatus> IStreamQuadIterator::Impl::get_bnode(std::str
                                         .col = serd_reader_get_current_col(this->reader),
                                         .message = std::string{e.what()} + ". note: position may not be accurate and instead point to the end of the triple."};
 
+        return nonstd::make_unexpected(SERD_ERR_BAD_SYNTAX);
+    } catch (...) {
+        this->last_error = ParsingError{.error_type = ParsingError::Type::BadBlankNode,
+                                        .line = serd_reader_get_current_line(this->reader),
+                                        .col = serd_reader_get_current_col(this->reader),
+                                        .message = "Unknown internal error. note: position may not be accurate and instead point to the end of the triple."};
+
         return nonstd::make_unexpected(SERD_ERR_BAD_SYNTAX);
     }
 }
@@ -160,6 +167,13 @@ nonstd::expected<Literal, SerdStatus> IStreamQuadIterator::Impl::get_literal(Ser
                                         .col = serd_reader_get_current_col(this->reader),
                                         .message = std::string{e.what()} + ". note: position may not be accurate and instead point to the end of the triple."};
 
+        return nonstd::make_unexpected(SERD_ERR_BAD_SYNTAX);
+    } catch (...) {
+        this->last_error = ParsingError{.error_type = ParsingError::Type::BadLiteral,
+                                        .line = serd_reader_get_current_line(this->reader),
+                                        .col = serd_reader_get_current_col(this->reader),
+                                        .message = "Unknown internal error. note: position may not be accurate and instead point to the end of the triple."};
+
         return nonstd::make_unexpected(SERD_ERR_BAD_SYNTAX);
     }
 }