Form date_time attribute error

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$this->app is null and creates error 'Call to member function make() on null'
Fix: Change line 12 of concrete/attributes/date_time/form.php
$form = $this->app->make('helper/form');

to:
$form = Loader::helper('form');


https://github.com/dreinhart/concrete5/blob/35ce5b662311b3815524f892...


Status: New

concrete5 Environment Information

# concrete5 Version
Core Version - 8.2.1
Version Installed - 8.2.1
Database Version - 20170802000000

# concrete5 Packages
Event Calendar PRO (2.3.5), White Label (1.0.1)

# concrete5 Overrides
<<removed>>

# concrete5 Cache Settings
Block Cache - Off
Overrides Cache - Off
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache/2.4.27 (cPanel) OpenSSL/1.0.2k mod_bwlimited/1.4

# Server API
cgi-fcgi

# PHP Version
5.6.31

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dba, dom, enchant, ereg, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, imap, intl, ionCube Loader, json, ldap, libxml, mbstring, mcrypt, mhash, mysql, mysqli, mysqlnd, odbc, openssl, pcntl, pcre, PDO, pdo_mysql, PDO_ODBC, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, pspell, readline, Reflection, session, shmop, SimpleXML, snmp, soap, sockets, SourceGuardian, SPL, sqlite3, standard, sysvmsg, sysvsem, sysvshm, tidy, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend Guard Loader, Zend OPcache, zip, zlib

# PHP Settings
max_execution_time - 30
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 512M
post_max_size - 128M
sql.safe_mode - Off
upload_max_filesize - 128M
ldap.max_links - Unlimited
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
odbc.max_links - Unlimited
odbc.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
pgsql.max_links - Unlimited
pgsql.max_persistent - Unlimited
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
opcache.max_accelerated_files - 2000
opcache.max_file_size - 0
opcache.max_wasted_percentage - 5
zend_optimizerplus.max_accelerated_files - 2000
zend_optimizerplus.max_file_size - 0
zend_optimizerplus.max_wasted_percentage - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 6.1; rv:55.0) Gecko/20100101 Firefox/55.0