error handling for file open failure.

Author: ljonesfl

src/Log/Destination/File.php

@@ -83,6 +83,12 @@ public function close(): void
 
 	public function write( string $text, Log\Data $data ): void
 	{
+		// Only write if file handle is valid
+		if( !$this->_file || !is_resource( $this->_file ) )
+		{
+			return;
+		}
+
 		fwrite(	$this->_file,
 					"$text\r\n" );
 	}

tests/Log/Destination/FileTest.php

@@ -42,4 +42,24 @@ public function testOpenFail()
 
 		$this->assertFalse( $Pass );
 	}
+
+	public function testWriteWithInvalidFileHandle()
+	{
+		$File = new File( new CSV() );
+
+		// Open should fail
+		$Pass = $File->open(
+				[
+					'file_name' => "//invalid//path/%DATE%"
+				]
+			);
+
+		$this->assertFalse( $Pass );
+
+		// Write should not crash even with invalid file handle
+		$File->log( "Test message", RunLevel::ERROR );
+
+		// Test passes if no exception is thrown
+		$this->assertTrue( true );
+	}
 }