Add check on null for stylesXMLFilePath property (#248)

* Add check on null for stylesXMLFilePath property in getNumberFormatCode method of XLSX Reader StyleManager

* add test for xlsx without styles file

* fix code style

* fix code style #2

src/Reader/XLSX/Manager/StyleManager.php

@@ -98,6 +98,10 @@ public function shouldFormatNumericValueAsDate(int $styleId): bool
 
     public function getNumberFormatCode(int $styleId): string
     {
+        if (null === $this->stylesXMLFilePath) {
+            return '';
+        }
+
         $stylesAttributes = $this->getStylesAttributes();
         $styleAttributes = $stylesAttributes[$styleId];
         $numFmtId = $styleAttributes[self::XML_ATTRIBUTE_NUM_FMT_ID];

tests/Reader/XLSX/ReaderTest.php

@@ -607,6 +607,31 @@ public function testReadShouldSkipFormulas(): void
         self::assertEquals($expectedRows, $allRows);
     }
 
+    public function testReadXlsxWithoutStyles(): void
+    {
+        $allRows = [];
+        $resourcePath = TestUsingResource::getResourcePath('xlsx_without_styles_file.xlsx');
+
+        $options = new Options();
+        $options->setTempFolder((new TestUsingResource())->getTempFolderPath());
+        $reader = new Reader($options);
+        $reader->open($resourcePath);
+
+        foreach ($reader->getSheetIterator() as $sheet) {
+            foreach ($sheet->getRowIterator() as $row) {
+                $allRows[] = $row->toArray();
+            }
+        }
+
+        $reader->close();
+
+        $expectedRows = [
+            ['data', 'data', 'data', 'data', 'data', 'data', 'data', 'data', 'data'],
+            [0, 0, 0, 'data', 'data', '', 12345],
+        ];
+        self::assertSame($expectedRows, $allRows);
+    }
+
     public function testReadMultipleTimesShouldRewindReader(): void
     {
         $allRows = [];