[MacPorts] #59043: meld @3.18.1: any port command resulta in error " Error: Unable to open port: unknown option setup_args"

[MacPorts]

#59043: meld @3.18.1: any port command resulta in error " Error: Unable to open
port: unknown option setup_args"
--------------------+--------------------
 Reporter:  wilya7  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  meld
--------------------+--------------------
 While doing a cleaning up after an update
 {{{
 sudo port -d -v -f clean --all all
 }}}
 I stumbled to the error described in the subject of this report while
 processing meld. Subsequently I saw that any port command directed to
 **meld** package ends up with the same **Error: Unable to open port:
 unknown option setup_args**. Here one example
 {{{
 sudo port -d -v -f clean --all meld

 DEBUG: Copying /Users/cfusco/Library/Preferences/com.apple.dt.Xcode.plist
 to /opt/local/var/macports/home/Library/Preferences
 DEBUG: Changing to port directory:
 /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/textproc/meld
 DEBUG: OS darwin/18.7.0 (Mac OS X 10.14) arch i386
 DEBUG: Re-registering default for build.cmd
 DEBUG: Re-registering default for destroot.cmd
 DEBUG: Re-registering default for destroot.destdir
 DEBUG: Sourcing PortGroup python 1.0 from
 /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/group/python-1.0.tcl
 DEBUG: Sourcing PortGroup app 1.0 from
 /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/group/app-1.0.tcl
 DEBUG: Sourcing PortGroup active_variants 1.1 from
 /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/group/active_variants-1.1.tcl
 DEBUG: unknown option setup_args
     while executing
 "error "unknown option $var""
     (procedure "python_get_defaults" line 30)
     invoked from within
 "python_get_defaults setup_args"
     invoked from within
 "destroot.cmd            "${python.bin} setup.py [python_get_defaults
 setup_args] --no-update-icon-cache --no-compile-schemas""
     (file "Portfile" line 36)
     invoked from within
 "source Portfile"
     invoked from within
 "$workername eval {source Portfile}"
     (procedure "mportopen" line 50)
     invoked from within
 "mportopen $porturl [array get options] [array get requested_variations]"
 Error: Unable to open port: unknown option setup_args
 }}}
 Is my port tree broken? I did do a port selfupdate, with no success.

 This is my system:
 {{{
 sw_vers
 ProductName:    Mac OS X
 ProductVersion: 10.14.6
 BuildVersion:   18G95
 }}}

 {{{
 Sudo port version
 Version: 2.5.4
 }}}

 I also downgraded Xcode 10.3 to Xcode 10.2.1, no change.

-- 
Ticket URL: <https://trac.macports.org/ticket/59043>
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